Question

evaluate cos 48 degree cos 42 degree -
sin 48 degree sin 42 degree​

Answer 1

Answer:

0

Step-by-step explanation:

$\cos(x + y) = \cos(x) \cos(y) - \sin(x) \sin(y)$

x= 48 and y= 42

cos (48+42)=0

Answer 2

Look at the pic carefully