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

`-1`

B

1

C

`-a^2`

D

`a^2`

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The correct Answer is:

A

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