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Differentiate w.r.t. x the function cos"...

Differentiate w.r.t. x the function `cos" "(a" "cos" "x" "+" "b" "s in" "x)` , for some constant a and b.

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Let `y=cos(acosx+bsin x)`
`(dy)/(dx)=(d)/(dx)cos(acosx+bsin x)`
`= -sin(acosx+bsin x)*(d)/(dx)(acosx+bsin x)`
`= -sin(acosx+bsin x)*(-asinx+bcos x)`
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