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A day full of math games & activities. Find one near you.

A day full of math games & activities. Find one near you.

A day full of math games & activities. Find one near you.

# Verify the identity. sin(x + y) - sin(x - y) = 2 cosx siny

**Solution:**

Given sin(x + y) - sin(x - y)

Here, we are using the following trignometric identitites:

sin(A + B) = sinAcosB + sinBcosA

sin(A - B) = sinAcosB - sinBcosA

Hence,sin(x + y) - sin(x - y) = sinxcosy + sinycosx - (sinxcosy - sinycosx)

sin(x + y) - sin(x - y) = sinxcosy + sinycosx - sinxcosy + sinycosx

sin(x + y) - sin(x - y) = sinxcosy + sinycosx - sinxcosy + sinycosx

sin(x + y) - sin(x - y) = sinycosx + sinycosx

sin(x + y) - sin(x - y) = 2sinycosx

Hence verified.

## Verify the identity. sin (x + y) - sin (x - y) = 2 cos x sin y

**Summary:**

The equation sin (x + y) - sin (x - y) = 2 cos x sin y is verified.

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