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September 21, 2014

September 21, 2014

Posted by **Sasha** on Wednesday, October 6, 2010 at 10:04pm.

- calculus -
**Joshie**, Wednesday, October 6, 2010 at 10:19pmf'(x) = secxtanx then use the product rule and figure out the derivative of that:

f''(x) = tanxsecxtanx + secx sec^2x and then it becomes tan^2x + sec^3x.

then you plug in pi/4 which is 45 degrees.

it is (1)(1.41) + 2.83 and the answer is 4.24

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