Math, asked by DRohanKumar, 1 year ago

What is the value of Cos(45°+A)+Cos(45°-A)

Answers

Answered by Hariharpal
2

Step-by-step explanation:

cos(45°+A) + cos (45°-A)

= cos 45° cos A - sin 45° sin A + cos 45° cos A + sin 45° sin A

= (1\√2) cos A - (1/√2) sin A + (1/√2) cos A + (1/√2) sin A

= 2(1/√2) cos A

=√2 cos A

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