write the trigonometric ratio of compound angles which is equal to cosA cosB - sinA sinB
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Step-by-step explanation:
sin (A + B) = sin A cos B + cos A sin B
sin (A - B) = sin A cos B - cos A sin B
cos (A + B) = cos A cos B - sin A cos B
cos (A - B) = cos A cos B + sin A cos B
tan (A + B) = [tan A + tan B] / [1 - tan A tan B]
tan (A - B) = [tan A - tan B] / [1 + tan A tan B
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