Asked by mock

If f(x) = 7x^6cos^-1x, find f '(x).

Answers

Answered by Damon
y = 7 x^6 cos^-1 x

f' = 7[ x^6 (1/(1-x^2)) + 6x^5 cos^-1 x ]

= 7 x^6/(1-x^2) + 42x^5 cos^-1 x
Answered by Steve
d/dx cos^-1(x) = -1/√(1-x^2)
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