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Prove the following identities: a. cos(x)+sin(x)cos3(x)+sin3(x)+cos(x)sin(x)cos3(x)sin3(x)=2 Prove the following identities: a. cos(x) sin(x) cos(x) sin(x)

Prove the following identities: a. cos(x)+sin(x)cos3(x)+sin3(x)+cos(x)sin(x)cos3(x)sin3(x)=2

Prove the following identities: a. cos(x) sin(x) cos(x) sin(x)

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