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