23 Maths -- Derivatives and its Application

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Derivative of trigonometric function sinx and cosx

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DERIVATIVE OF 'sinx'

Let y=sinx…….i

Then,

Now,
Subtracting i from ii we get,

By the first principle,

DERIVATIVE OF 'cosx'

Let y=cosx……. i

Then,

Now,
Subtracting i from ii we get,

By the first principle,

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