Question

cos 45 - sin 45 please answer in step

Answer 1

cos 45 = sin 45 = 1/√2

cos 45 - sin45 = 0

Answer 2

We know,
$\sin( \alpha ) = \cos(90 - \alpha )$
similarly,
$\sin(45 ) = \cos(90 - 45) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \cos(45)$
so, Sin 45 - Cos 45 =0