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sec^2theta=4xy/(x+y)^2 is true if and on...

`sec^2theta=4xy/(x+y)^2` is true if and only if

A

`x=y ne0`

B

x=y,`x ne 0`

C

x=y

D

`x ne0,y ne0`

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The correct Answer is:
A, B
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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
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  10. If Pn=sin^ntheta+cos^ntheta where n in W (whole number)and theta in R ...

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  11. If Pn=sin^ntheta+cos^ntheta where n in W (whole number)and theta in R ...

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  12. If Pn=sin^ntheta+cos^ntheta where n in W (whole number)and theta in R ...

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  14. if f(theta)=acostheta+bsintheta then -sqrt(a^2+b^2)lef(theta)lesqrt(a^...

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