Question

cos 48 × cos 42 - sin 48 × sin 40​

Answer 1

cos 48= -0.64

cos 42= -0.4

sin 42 = -0.77

sin 40 = 0.75

(-0.64×-0.4) - (-0.77×0.75)

0.256 - -0.578

-0.322

Answer 2

Answer:

Step-by-step explanation: i think question might be cos48.cos42-sin48.sin42

This can be written as sin(90-48).cos42-cos(90-48).sin 42.

=sin42.cos42-cos42.sin42=0.

I hope u understand.

If u understand add this as brainliest answer.

Thank u