How do I prove this trigonometric identity?

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The farthest I've gotten is converting the left side to 7cos^2x-sinxcosx-4, but I don't know where to go from there.

Aug 9th, 2015

Thank you for the opportunity to help you with your question!

can u post the original question???




Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 9th, 2015

Oops, sorry about that, I thought that popping in an image would let me post text too. I reuploaded the question at https://www.studypool.com/free/229819/how-do-i-prove-this-trigonometric-identity-1

Aug 9th, 2015

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