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If s e c^2theta=(4x y)/((x+y)^2) is true...

If `s e c^2theta=(4x y)/((x+y)^2)` is true if and only if `x+y!=0` (b) `x=y , x!=0` (c) `x=y` (d) `x!=0,y!=0`

A

`x=y`

B

`x lt y`

C

`x gty`

D

none of these

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The correct Answer is:
A
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -COMPETITIVE THINKING
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