How do you find the derivative of $cos(pi x)$ ?

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Answer 1 · 2018-08-14T22:50:00

$(dy)/(dx)=-pisin(pix)$

Let,

$y=cos(pix)$

$:.(dy)/(dx)=-sin(pix)d/(dx)(pix)$

$:.(dy)/(dx)=-sin(pix)(pi)$

$:.(dy)/(dx)=-pisin(pix)$

How do you find the derivative of cos(pi x)cos(pi x)?