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Let z = (cosx)^5 and y = sinx. Then the ...

Let `z = (cosx)^5` and `y = sinx`. Then the value of `(d^2z)/(dy^2)` at `x = (2pi)/9` is

A

`-1/2`

B

`3/2`

C

`5/2`

D

`-3/2`

Text Solution

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The correct Answer is:
C
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