Question

antiderivative of π cos π x

Answer 1

anti derivative means the integration

integration of
$\pi \cos(\pi \: x)$
is
$\pi \: integration \: of \: \cos( \pi \: x)$
pi is constant so it will be outside

$\pi \sin(\pi \: x) + c$

hope this helps you


NOTE

you cannot remove pi from cos ( pi x)
as it is an angle