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If ` x = a sec theta cos phi, y = b sec thetasin phi and z = c tan theta`, then the value of `x^2/a^2 + y^2/b^2 -z^2 /c^2` is

A

1

B

0

C

`-`

D

`a^2+b^2`

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The correct Answer is:
A
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PUNEET DOGRA-3-D GEOMETRY-PREV YEAR QUESTIONS
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