The formula to find derivative of a function f(x) using first principle :
Derivative of sinx using first principle :
Let
f(x) = cos(x2)
Sum to Product Trigonometric Identity,
In f'(x) above,
C = (x + h)2
D = x2
From standard results of limits,
Therefore,
[cos(x2)]' = 2xsin(x2)
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