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Dvinal [7]
3 years ago
8

What is f'(X) on the equation ?

Mathematics
1 answer:
mixas84 [53]3 years ago
7 0
f(x) =  cos^{4} (4 - 3x)                        


(derivative of cos(x) is -sin(x))

f(x) =  (cos(4-3x))^{4}             [cos²x is same as (cosx)²]

f'(x) = 4(cos(4-3x))³ (-sin(4-3x)) (-3)
f'(x) = -12 (cos(4-3x))³(-sin(4-3x))
f'(x) = 12 cos³(4-3x) sin(4-3x)

Thus, c is the correct answer.
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