## Calculus Tutorial

*chain rule twice*

#### Intro

The chain rule tells us how to take the derivative of their composition.

d/dx(f(g(x)))=f'(g(x)).g'(x)

#### Sample Problem

#### Solution

y=(cos(x3))2

dy/dx=2cos(x3).d/dx(cosx3) chain rule

d/dx(cosx3)=-sinx3.d/dx(x3) chain rule

d/dx(x3)=3×2 power rule

dy/dx=2cosx3.(-sinx3).3×2

=-6x2cosx3.sinx3

# About The Author

Mathematics Teacher |

I was a teacher in Srilanka from 1992 to 2006. I took tuition from 1990 to 1991 in India. I do general work in Canada but I help to do homework to my daughters. I finished my teacher\'s training college diploma in Srilanka. I completed my B.Sc degree course at Bharayiar university in India. |

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