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The derivative of sinx^(3) w.r.t. cosx^(...

The derivative of `sinx^(3)` w.r.t. `cosx^(3)` is

A

`-tanx^(3)`

B

`tanx^(3)`

C

`-cotx^(3)`

D

`cotx^(3)`

Text Solution

Verified by Experts

The correct Answer is:
C

Let u=sin `x^(3) and v=cosx^(3)`
On differentiating w.r.t. x, we get
`(du)/(dv)=cosx^(3) .3x^(2)`
and `(dv)/(dx)=-sinx^(3).3x^(2)`
`therefore(du)/(dv)=(du//dx)/(dv//dx)=(3x^(2)cosx^(3))/(-3x^(2)sinx^(3))`
`=-cotx^(3)`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 04-PAPER 2 (MATHMATICS)
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