Question

Expand the following cos(60°+A)​

Answer 1

Step-by-step explanation:

cos(A+60) = (cosA-✓3sinA)/2

Answer 2

Answer:

(cos A -√3.sin A) / 2

Step-by-step explanation:

We know,

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

therefore, cos(60°+A) = cos 60° cos A - sin 60° sin A

                                    =  (1/2)cos A - (√3/2) sin A

                                    = (cos A -√3.sin A) / 2

Hope this answer was helpful !