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## Calculus Proofs Resources

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1) given the double angle identity for cosine: cos2θ=cos2θ-sin2θ Prove: cos3θ = cos3θ - 3cosθsin2θ and: cos4θ = cos4θ - 6cos2θsin2θ + sin2θ 2)...

# Derivative Proofs

Derivative Proofs Though there are many different ways to prove the rules for finding a derivative, the most common way to set up a proof of these rules is to go back to the limit definition. This way, we can see how the limit definition works for various functions. We must remember that mathematics is a succession. It builds on itself, so many proofs rely on results... read more