Question 1 :
Differentiate F(x) = (x3 + 4x)7
Solution :
F(x) = (x3 + 4x)7
Let u = x3 + 4x
Differentiate the function "u" with respect to x, we get
du/dx = 3x2 + 4(1)
= 3x2 + 4
F(x) = u7
Differentiate the function "y" with respect to x, we get
F'(x) = 7u6 (du/dx)
F'(x) = 7(x3 + 4x)6 (3x2 + 4)
Question 2 :
Differentiate h(x) = (t - (1/t))3/2
Solution :
h(x) = (t - (1/t))3/2
Let u = t - (1/t)
Differentiate the function "u" with respect to x, we get
du/dx = 1 + (1/t2)
h(x) = u3/2
Differentiate the function "y" with respect to x, we get
h'(x) = (3/2)u1/2 (du/dx)
h'(x) = (3/2)(t - (1/t))1/2(1 + (1/t2))
Question 3 :
Differentiate f(t) = ∛(1 + tan t)
Solution :
f(t) = ∛(1 + tan t)
Let u = 1 + tan t
Differentiate the function "u" with respect to x, we get
du/dx = 0 + sec2t
= sec2t
f(t) = u1/3
Differentiate the function "y" with respect to x, we get
f'(t) = (1/3)u-2/3 (du/dx)
f'(t) = (1/3)(1 + tan t)-2/3 (sec2t)
f'(t) = (1/3)sec2t(1 + tan t)-2/3
Question 4 :
Differentiate y = cos (a3 + x3)
Solution :
y = cos (a3 + x3)
Let u = a3 + x3
Differentiate the function "u" with respect to x, we get
du/dx = 0 + 3x2
= 3x2
y = cos u
Differentiate the function "y" with respect to x, we get
dy/dx = -sin u (du/dx)
dy/dx = -sin (a3 + x3) (3x2)
= - 3x2sin (a3 + x3)
Question 5 :
Differentiate y = e-mx
Solution :
y = e-mx
Let u = -mx
Differentiate the function "u" with respect to x, we get
du/dx = -m (1)
= -m
y = eu
Differentiate the function "y" with respect to x, we get
dy/dx = eu (du/dx)
dy/dx = e-mx (-m)
dy/dx = -me-mx
Question 6 :
Differentiate y = 4 sec 5x
Solution :
y = 4 sec 5x
Let u = 5x
Differentiate the function "u" with respect to x, we get
du/dx = 5(1)
= 5
y = 4 sec u
Differentiate the function "y" with respect to x, we get
dy/dx = 4 sec u tan u (du/dx)
dy/dx = 4 sec 5x tan 5x (5)
dy/dx = 20 sec 5x tan 5x
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