# Proof of Trigonometric Identities

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More Lessons for A Level Maths

Math Worksheets

Videos, activities and worksheets that are suitable for A Level Maths.

Proof of A sin x + B cos x = R sin (x + alpha)
In this tutorial you are shown how to prove the above trig. identity.
Proof of A cos x + B sin x = R cos (x - alpha)
In this tutorial you are shown how to prove the above trig. identity.

Proof of A sin x - B cos x = R sin (x - alpha)
In this tutorial you are shown how to prove the above trig. identity.
Proof of A cos x - B sin x = R cos (x + alpha)
In this tutorial you are shown how to prove the above trig. identity.

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