find F''(pi/3) f(x)= 4cos(x/2) i got -cos(pi/6) but i don't thi...

sin^4cos^2x=(1/16)(1-cos 2x)(1-cos4x) work one 1 side only!

y=4cos(3x-2(3.14))

Let f(x)=4cos^5x. Find f'(x)

I need a graph for y = 3 - 4cos pi/5(x - 1)

sin(4x)/sin(x)=4cos(x)cos(x) verify the identity

(3-4cos(2x)+cos(4x))/(3+4cos(2x)+cos(4x))=tan^6(x)

Given y=2-4cos(3x-pi/4), find each of the following, giving the general representation of the locati...

4cos^2x-5sinxcosx-6=0 find the x :( please

If sin(x) = 4cos(x), then what is (sin(x))*(cos (x))?

Find the amplitude y=4cos(3x-pi)

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