Find the derivative?

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1 Answer
Shwetank Mauria
Nov 21, 2017

Derivative is #(-7x)/(1-x^2)+7cos^(-1)x+(49x)/(2sqrt(1-49x^2))#

Explanation:

As #f(x)=7xcos^(-1)x-sqrt(1-49x^2)#

#(df)/(dx)#

= #7*x*(-1/(1-x^2))+7cos^(-1)x-1/(2sqrt(1-49x^2))*(-98x)#

= #(-7x)/(1-x^2)+7cos^(-1)x+(49x)/(2sqrt(1-49x^2))#

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