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then then k’(x) k’(x) = = f ’ f ’ ( ( g(x) g(x) ) ) g’(x) g’(x) k(x) = k(x) = sin sin ( x ( x 2 2 ) ) k’(x) k’(x) = = cos cos ( x ( x 2 2 ) ) 2x 2x

If k(x) =f (g(x)), then k’(x) = f ’ ( g(x) ) g’(x) k(x) = sin( x 2 ) k’(x) = cos ( x 2 ) 2x

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If k(x) =If k(x) =ff (g(x)), then (g(x)), thenk’(x)k’(x) = = f ’f ’ (( g(x)g(x) )) g’(x)g’(x)k(x) = k(x) = sinsin( x( x22 ) )

k’(x)k’(x) = = cos cos ( x( x2 2 ) ) 2x2x

If y = sec(3If y = sec(3t), find y’t), find y’

A.A. 33 sec(3 sec(3t) tan(3t) tan(3t)t)

B.B. 33 sec tan (3 sec tan (3t)t)

C.C. sec(3sec(3t) tan(3t) tan(3t)t)

If y = sec(3If y = sec(3t), find y’t), find y’

A.A. 33 sec(3 sec(3t) tan(3t) tan(3t)t)

B.B. 33 sec tan (3 sec tan (3t)t)

C.C. sec(3sec(3t) tan(3t) tan(3t)t)

If y=tan(sin(x)), find y’If y=tan(sin(x)), find y’

A.A. -sec-sec22[sin(x)]cos(x)[sin(x)]cos(x)

B.B. secsec22[sin(x)]cos(x)[sin(x)]cos(x)

C.C. secsec22[cos(x)][cos(x)]

D.D. -csc-csc22[sin(x)]cos(x)[sin(x)]cos(x)

If y=tan(sin(x)), find y’If y=tan(sin(x)), find y’

A.A. -sec-sec22[sin(x)]cos(x)[sin(x)]cos(x)

B.B. secsec22[sin(x)]cos(x)[sin(x)]cos(x)

C.C. secsec22[cos(x)][cos(x)]

D.D. -csc-csc22[sin(x)]cos(x)[sin(x)]cos(x)

CorallaryCorallary

k(x) = gk(x) = gnn(x) = [g(x)](x) = [g(x)]nn

k’(x)k’(x) = n [g = n [g (x)] (x)] n-1n-1 g’(x)g’(x)

If y=(2x+1)If y=(2x+1)44, find y’, find y’

A.A. 4(2)4(2)33

B.B. 4(2x+1)4(2x+1)33

C.C. 8(2x+1)8(2x+1)

D.D. 8(2x+1)8(2x+1)33

If y=(2x+1)If y=(2x+1)44, find y’, find y’

A.A. 4(2)4(2)33

B.B. 4(2x+1)4(2x+1)33

C.C. 8(2x+1)8(2x+1)

D.D. 8(2x+1)8(2x+1)33

If y=x cos(xIf y=x cos(x22), find ), find dy/dxdy/dx

A.A. -x sin(x-x sin(x22) + cos(x) + cos(x22))

B.B. -2x sin(x-2x sin(x22) + cos(x) + cos(x22))

C.C. -2x-2x22 sin(x sin(x22) + cos(x) + cos(x22))

D.D. 2x2x22 sin(x sin(x22) + cos(x) + cos(x22))

If y=x cos(xIf y=x cos(x22), find ), find dy/dxdy/dx

A.A. -x sin(x-x sin(x22) + cos(x) + cos(x22))

B.B. -2x sin(x-2x sin(x22) + cos(x) + cos(x22))

C.C. -2x-2x22 sin(x sin(x22) + cos(x) + cos(x22))

D.D. 2x2x22 sin(x sin(x22) + cos(x) + cos(x22))

The chain ruleThe chain ruleIf y = If y = sin(sin(uu)) and u(x) = x and u(x) = x22

then dy/dx = dy/du du/dxthen dy/dx = dy/du du/dx

dy/du = cos(dy/du = cos(uu) d) duu/dx = /dx = 2x2x

dy/dx = dy/dx = cos(cos(uu) ) 2x2x

= = cos(cos(xx22) ) 2x2x

The chain ruleThe chain ruleIf y = If y = cos(cos(uu)) and u(x) = x and u(x) = x22 + 3x + 3x

then dy/dx = dy/du du/dxthen dy/dx = dy/du du/dx

dy/du = -sin(dy/du = -sin(uu) d) duu/dx = /dx = 2x + 32x + 3

dy/dx = dy/dx = -sin(-sin(uu) ) (2x+3)(2x+3)

= = -sin(-sin(xx22+2x+2x) ) (2x+3)(2x+3)

y=tan(u) u = 10x – 5y=tan(u) u = 10x – 5find dy/dxfind dy/dx

A.A. -10 csc-10 csc22(10x-5)(10x-5)

B.B. secsec22(10)(10)

C.C. -csc-csc22(10x-5)(10x-5)

D.D. 10 sec10 sec22(10x-5)(10x-5)

y=tan(u) u = 10x – 5y=tan(u) u = 10x – 5find dy/dxfind dy/dx

A.A. -10 csc-10 csc22(10x-5)(10x-5)

B.B. secsec22(10)(10)

C.C. -csc-csc22(10x-5)(10x-5)

D.D. 10 sec10 sec22(10x-5)(10x-5)

y= uy= u22+u u = 10x+u u = 10x22 – x – xfind dy/dxfind dy/dx

A.A. (20 x(20 x22 – 2x)(20x-1) – 2x)(20x-1)

B.B. (20 x(20 x22 – 2x +1)20x – 2x +1)20x

C.C. (20 x(20 x22 - 1)(20x-1) - 1)(20x-1)

D.D. (20 x(20 x22 – 2x +1)(20x-1) – 2x +1)(20x-1)

y= uy= u22+u u = 10x+u u = 10x22 – x – xfind dy/dxfind dy/dx

A.A. (20 x(20 x22 – 2x)(20x-1) – 2x)(20x-1)

B.B. (20 x(20 x22 – 2x +1)20x – 2x +1)20x

C.C. (20 x(20 x22 - 1)(20x-1) - 1)(20x-1)

D.D. (20 x(20 x22 – 2x +1)(20x-1) – 2x +1)(20x-1)

CorallaryCorallary

k(x) = [3xk(x) = [3x3 3 - x- x-2 -2 ]]2020

k’(x)k’(x) = 20 [3x = 20 [3x3 3 - x- x-2-2] ] 1919 ( (9x9x22+2x+2x--

33))

CorallaryCorallary

y = [3xy = [3x3 3 - x- x-2 -2 ]]2020

let u = [3xlet u = [3x3 3 - x- x-2 -2 ] ]

du/dx = (du/dx = (9x9x22+2x+2x-3-3)) y=uy=u2020 dy/dx=dy/du du/dx = dy/dx=dy/du du/dx = 20u20u1919 du/dx du/dx

= 20 [3x= 20 [3x3 3 - x- x-2-2] ] 1919 ( (9x9x22+2x+2x-3-3))

If y = (sec(x))If y = (sec(x))22=sec=sec22(x) (x) find dy/dxfind dy/dx

A.A. 2 sec(x) tan(x)2 sec(x) tan(x)

B.B. 2 sec2 sec22(x) tan(x)(x) tan(x)

C.C. 2 sec(x)2 sec(x) tantan22(x)(x)

D.D. secsec22(x)(x) tantan (x)(x)

If y = (sec(x))If y = (sec(x))22=sec=sec22(x) (x) find dy/dxfind dy/dx

A.A. 2 sec(x) tan(x)2 sec(x) tan(x)

B.B. 2 sec2 sec22(x) tan(x)(x) tan(x)

C.C. 2 sec(x)2 sec(x) tantan22(x)(x)

D.D. secsec22(x)(x) tantan (x)(x)

CorallaryCorallary

=[3x=[3x3 3 - x- x2 2 ]]1/21/2

k’(x)k’(x) = ½ [3x = ½ [3x3 3 - x- x22]]-1/2-1/2 ( (9x9x22-2x-2x))

3 2( ) 3k x x x

CorallaryCorallary

k’(x)k’(x) = =

( ) ( )k x g x

1'( )

2 ( )g x

g x'( )

2 ( )

g x

g x

CorallaryCorallary

k’(x)k’(x) = =

3 2( ) 3k x x x 29x -2x3 22 3x x

If y = find If y = find dy/dxdy/dx

A.A. csccsc3/23/2(x)(x)

B.B. ..

C.C. ..

D.D. ..

csc( )x

csc( )cot( )

2 csc( )

x x

x

csc( )cot( )

2 csc( )

x x

x

csc( )cot( )

csc( )

x x

x

If y = find If y = find dy/dxdy/dx

A.A. csccsc3/23/2(x)(x)

B.B. ..

C.C. ..

D.D. ..

csc( )x

csc( )cot( )

2 csc( )

x x

x

csc( )cot( )

2 csc( )

x x

x

csc( )cot( )

csc( )

x x

x

CorallaryCorallary

= [sin(2x)= [sin(2x) ]]1/21/2

k’(x)k’(x) = ½ [sin(2x)] = ½ [sin(2x)]-1/2-1/2 ( (cos(2x) cos(2x) 22))

( ) sin(2 )k x x

k(x) = sec(sin(2x)) k(x) = sec(sin(2x))

k’(x)k’(x) = =

secsec(sin(2x))(sin(2x))tantan(sin(2x))(sin(2x))((cos(2x) 2cos(2x) 2))

y = sec(sin(2x)) let u = y = sec(sin(2x)) let u = sin(2x) sin(2x)

dy/dx = dy/du du/dx dy/dx = dy/du du/dx

y = sec u y = sec u

y = sec(u) where u = sin(2x) y = sec(u) where u = sin(2x)

dy/dx = dy/du du/dx dy/dx = dy/du du/dx

= sec u tan u cos(2x) 2= sec u tan u cos(2x) 2

y = sec(u) where u = sin(2x) y = sec(u) where u = sin(2x)

dy/dx = dy/du du/dx dy/dx = dy/du du/dx

= sec u tan u cos(2x) 2= sec u tan u cos(2x) 2

secsec(sin(2x))(sin(2x))tantan(sin(2x))(sin(2x))((cos(2x) 2cos(2x) 2))

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

after the beginning of a race is after the beginning of a race is given bygiven by

a)a)Find and explain.Find and explain.b)b)Find R’(t).Find R’(t).c)c)Find R’(10) and explain.Find R’(10) and explain.d)d)Find R(10) and explain. Find R(10) and explain.

21400 3 204( )20

t tR t

t

lim ( )tR t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

a) Find and explain.a) Find and explain.

2 21400 3 20 /

4lim( 20) /t

t t t

t t

lim ( )tR t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

a) Find and explain.a) Find and explain.

2 21400 3 20 /

4lim( 20) /t

t t t

t t

lim ( )tR t

2

1 3 20400

4lim20

(1 )t

t t

t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

a)a) Find and explain.Find and explain.

2 21400 3 20 /

4lim( 20) /t

t t t

t t

lim ( )tR t

2

1 3 20400

4lim 20020

(1 )t

t t bpm

t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

a)a) Find and explain.Find and explain.

Mary’s maximum heart rate is Mary’s maximum heart rate is 200 bpm = 220 – age 200 bpm = 220 – age making her age close to 20.making her age close to 20.

2 21400 3 20 /

4lim( 20) /t

t t t

t t

lim ( )tR t

1 3 20400

4lim 20020

(1 )t

t t bpm

t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds after the beginning of a race is after the beginning of a race is given bygiven by

a)a)..b)b)Find R’(t)Find R’(t)c)c)Find R(10) = 115.47 bpmFind R(10) = 115.47 bpmd)d)Find R’(10) and explain. Find R’(10) and explain.

21400 3 204( )20

t tR t

t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

Find R’(t)Find R’(t)

2

2

2

400( 3) 12( 20) 400 3 2041

2 3 204'( )

( 20)

t

t t t

t tR t

t

21400 3 204( )20

t tR t

t

2

2 2

( 20)(200 1200) 800( 3 20)4

12 3 20( 20)4

tt t t

t t t

Number of heart Number of heart beats per minute, t beats per minute, t seconds seconds

Find R’(t)Find R’(t)R’(10) = 2.3094R’(10) = 2.3094bpm/minbpm/min

2

2 2

( 20)(200 1200) 800( 3 20)4

12 3 20( 20)4

tt t t

t t t

quizzquizz

1.Write the equation of the 1.Write the equation of the line tangent to the graph of line tangent to the graph of

y = x – cos(x) when x=0.y = x – cos(x) when x=0.

2. Diff. g(x)=cot x [sin x – cos 2. Diff. g(x)=cot x [sin x – cos x].x].

3. Find the x’s where the lines 3. Find the x’s where the lines tangent to y= are tangent to y= are horizontal.horizontal.

sin

1 cos

x

x