f(x)=tan(5x)

find f'(x) and f"(x)

so i found f'(x) to be 5*sec^2(5x)

i am having trouble finding f"(x)

i thought it was 25*sec^2(5x)*tan^2(5x) but it wrong.

could i get some help with the second derivative please =)

thank you

chad

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- Sep 30th 2009, 09:16 AMmybrohshi5derivative help
f(x)=tan(5x)

find f'(x) and f"(x)

so i found f'(x) to be 5*sec^2(5x)

i am having trouble finding f"(x)

i thought it was 25*sec^2(5x)*tan^2(5x) but it wrong.

could i get some help with the second derivative please =)

thank you

chad - Sep 30th 2009, 09:23 AMHallsofIvy