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If f(x) = 9x10 tan-1x, find f '(x).
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If f(x) = 9x10 tan-1x, find f '(x).

User Wenic
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f(x) = 9x10tan-1(x)

Use the product rule to derive.

Let g(x) = 9x10
Let h(x) = tan-1(x)

Product rule:

f'(x) = g'(x)h(x) + g(x)h'(x)

f'(x) = 90x9tan-1 - [9x10 / (1 + x2)]
User Philwb
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