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if x=a cos^(4) theta, y= a sin^(4) theta...

if `x=a cos^(4) theta, y= a sin^(4) theta, "then" (dy)/(dx)"at" theta=(3pi)/(4)` is

A

` a ^(2) `

B

`-a^(2)`

C

` 1`

D

`-1`

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The correct Answer is:
D
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