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Trigonometry Formulae: Don’t try to remember just know the concept of derivation With the help of sin (A + B), we can derive all the remaining trigonometric formulae. Let’s see, how ….. Compound Angle (1) $$\sin \left( A+B \right)=\sin A\cos B+\cos A\sin B$$ (2) $$\sin \left( A-B \right)=\sin A\cos B-\cos A\sin B$$ (3) \(\cos \left( […]