- #1

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## Homework Statement

sin5xcos3x=sin4xcos4x+sinxcosx, solve the identity

## Homework Equations

all the identities and formulas mentioned in my last thread.

## The Attempt at a Solution

Alright so I thought I could use the product to sum formula on the left side which ended up being 1/2sin10x then I used the sum/difference formula on the right side and got sin5x. Now according to my calculator these are not the same, so where have I gone wrong?