Question

Evaluate the following :

Cos 28° - sin 42° =

Answer 1

Step-by-step explanation:

$cos28 - sin42 \\ \\ = sin(90 - 28) - sin42 \\ \\ = sin28 - sin28 \\ \\ = 0$

hope it helps......✌✌

Answer 2

using identity cosA = sin( 90 - A)

cos 28° - sin (90-42)°

cos 28 - cos 28°

= 0