Well, first of all, you need to keep the 2 in the argument of the first function. That is,
Next, I find it rather difficult to work with trig functions if they have differing arguments. How could you get them to have the same argument?
For the chapter on max/min, I am really having no problem calculating things that lead to finding the max and min values. I seem to only reach a roadblock after you find the derivative of something involving trig. For example:
f(x)=sin(2x) + cos(x) on interval 0 </ x </ pi
So, finding derivative:
f'(x)= 2cos2x - sinx
I'm pretty bad with trig (detrimental, I know), so I don't really know how to solve for x. How can you find the critical values with such a function? A step by step explanation process would be greatly appreciated!