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# First principles using standard theorems on trigonometric limits

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Using the definition of the derivative and any standard limiting theorems, show that the derivative of (sinx)^2 is sin(2x).

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Derivatives from first principles using standard theorems on trigonometric limits are shown. The solution is detailed and well presented.

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Firstly we need the following results on standard trigonometric limits. These are proved in any standard textbook on ...

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