Question: pre calculas, please use neat handwriting or type the answer so I can understand. Use sum/difference formulas to prove the identity: COs (7 - X

pre calculas, please use neat handwriting or type the answer so I can understand.

pre calculas, please use neat handwriting or type the answer so I

Use sum/difference formulas to prove the identity: COs (7 - X )+ sin (7 + x)=-cosx - sinx

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