23 Maths -- Derivatives and its Application

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Derivative of trigonometric function tanx and cotx

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DERIVATE OF tanx
Let y=tanx……. i

Then,

Now,
Subtracting i from ii we get,

By the first principle,

DERIVATE OF cotx
Let y=cotx……. i

Then,

Now,
Subtracting i from ii we get,

By the first principle,

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