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I'm following a path similar to the post on http://www.askmehelpdesk.com/mathematics/verify-identity-sin-3-x-cos-3-x-sin-x-cos-x-1-sin-x-cos-x-500483.html

However, I keep getting 1-(sinx*cosx) when solving for mine as I end up with ((sinx-cosx)(1-sinxcosx))/sinx-cosx

Help, please?