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If x= a cos^(3) theta, y= a sin^(3) thet...

If `x= a cos^(3) theta, y= a sin^(3) theta`, then `1 + ((dy)/(dx))^(2)` is______

A

1

B

`sec^(2) theta`

C

`tan^(2) theta`

D

`tan theta`

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The correct Answer is:
B
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