Question: Rewrite the expression as a simplified expression containing one term. cos a cos (a + B) + sin a sin (a + B) cos a

Rewrite the expression as a simplified expression containing one term. cos

Rewrite the expression as a simplified expression containing one term. cos a cos (a + B) + sin a sin (a + B) cos a cos (a + B) + sina sin (a + p) = (Type an expression. Simplify your answer.)

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