Question

Cos 38 cos 52 - sin 38 sin 52​

Answer 1

Answer:

Cosx cosy - sinx Siny = cos(x+y)

Cos 38 cos 52 - sin 38 sin 52 = cos ( 38 + 52 ) = cos 90 = 0

Answer 2

Step-by-step explanation:

cos(90-52).cos(90-38)-sin38.sin52

sin52.sin38-sin38.sin52

=0