The square root of x = x to the power of a half
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The derivative of sqrt(2) is zero.
The derivative of cos x is -sin x, the derivative of square root of x is 1/(2 root(x)). Applying the chain rule, the derivative of cos root(x) is -sin x times 1/(2 root(x)), or - sin x / (2 root x).
3/(4*square root(x)) ....Mukesh
The derivative of any constant - any expression that does not involve the independent variable - is zero.
The derivative, with respect to x, is -x/sqrt(1-x2)