How to Find the Derivative of a Trigonometric Function?

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Homework Statement



if f(x) = SQRT[X]TAN[X] + 2X / SIN[X]+COS[X]
Find f`(pi/4)

Homework Equations



doon't know

The Attempt at a Solution

 
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Are you familiar with the product rule and the quotient rule and the derivatives of trigonometric functions? If you are, just apply what you know, and show us an attempt. If you aren't, then read your textbook.
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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