1.

Solve: cos5x . cos(x5).

Answer»

Let y = cos5x . cos(x5

\(\frac{dy}{dx}\) = cos5x(-sin(x5)5x4) + cos(x5).5cos4x.(-sinx) 

= – cos5x sin(x5) 5x4 – 5 cos(x5) . cos4x . sinx



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