Find the derivative of $\cos x$ from first principle.

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Calculus 1 / AB

NCERT Class 11 - Math

Chapter 13

Limits and Derivatives

Section 2

Coordinate Axes and Coordinate Planes in Three Dimensional Space

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Video Transcript

in this problem we have fx as cossacks let let us find the derivative of effects act. So from first principle it is given as They met extends to zero effort. A passage minus F F E divided by edge This is nothing but limit. It's tends to zero goes off A plus edge minus cause off. Hey, this divided by edge cause of helpless. It is nothing but cause a into Cosby minus sign A into sign me minus casa thing divided by edge. This is limit extends to zero. This is nothing but limit. It's tends to zero taking cost in common he says Cause H -1 by and minus limit It's tends to zero sign into sign. Edge right bitch, this is nothing but minus costs A limit It stands to zero one minus cause edge by edge minus signage sentences minus sign A to limit It's tends to zero saying that spain catch No, we know that limit extends to 01 minus corsets by 80 This is zero minus limits, extends to zero sign. It's by it's just 10 minus sign, which is minus sign. So the limit, so the derivative of fx at e s minus I'm A. So I can see every dash X. It's nothing but a minus sign. Thanks, that's all.

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