Derivative of sin(x) and cos(x), PROOF
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derivatives of tan(x) and cot(x), quotient rule, cofunction identities
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the most controversial limit in calculus 1
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Derivative of sin x and cos x
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easy derivative but it took me 32 minutes
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Derivatives of ALL trig functions (proofs!)
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Proof: Derivative of Sin is Cos (Version 2)
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The most important limit in Calculus // Geometric Proof & Applications
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