Question

cos 38 ×cos 22 - sin 38×sin 22​

Answer 1

Step-by-step explanation:

cos 38 ×cos 22 - sin 38×sin 22=cos(38+22)=cos60=1/2

Answer 2

Answer:

1/2

Step-by-step explanation:

Given:- cos38 cos22 - sin38 sin22

To Find:- the value of above expression.

Solution:-

As according to the Trigonometric Formula,

cos(A + B) = cos A cos B − sin A sin B

∴ cos38° cos22° - sin38° sin22° = cos (38 + 22)°

                                                    = cos 60°

                                                    = 1/2

Therefore, cos38° cos22° - sin38° sin22° = 1/2

#SPJ2