Prove that the equation is an identity.
-cos (x + y) cos (x - y) =
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Q178: Prove that the equation is an identity.
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Q179: Simplify the expression. Q180: Prove that the equation is an identity. Q181: Prove that the equation is an identity. Q182: Prove that the equation is an identity. Q184: Prove that the equation is an identity. Q185: Prove that the equation is an identity. Q186: Prove that the equation is an identity. Q187: Prove that the equation is an identity. Q188: Prove that the equation is an identity.
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