x^2cosx-2xsinx-2cosx

3 answers

I assume that you want the derivative, since you titles your post that way.

if y = x^2cosx-2xsinx-2cosx
dy/dx = (x^2)(-sinx) + 2x cosx - 2x(-cosx) - 2sinx + 2sinx
= -x^2( sinx) + 4x( cosx)

etc if needed

d/dx sinx = cosx

yup!
sloppiness on my part

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