Question

if 8
$if8a = \pi \: then \: \: \cos(7a ) + \cos(a) is \: equal \: to$
=​

Answer 1

Answer:

0

Step-by-step explanation:

if 8a=π,then a=π/8

putting the value of a=π/8 we get,

cos 7π/8+cos π/8

cos(π-π/8)+cos π/8

-cos π/8+cos π/8 [cos (π-@)=-@]

0