# Trigonometric Functions of Sum and Difference of Angles

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1. For any two angles A and B, cos (A -B) = cos A cos B + sin A sin B

2. For any two angles A and B, cos (A + B) = cos A cos B − sin A sin B

3. For any two angles A and B, sin (A − B) = sin A cos B − cos A sin B

4. For any two angles A and B, sin (A + B) = sin A cos B + cos A sin B

5. For any two angles A and B, tan (A + B) = (tan A + tan B)/(1 –tan A tan B)

6. For any two angles A and B, tan (A -B) = (tan A -tan B)/(1 + tan A tan B)

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