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If `a sin^(2)theta +b cos^(2)theta= a cos^(2)phi+b sin^(2)phi=1 and a tan theta=b tan phi(a pi b)` then

A

`a+b=2ab`

B

`a-b=2ab`

C

`a-b+2ab=0`

D

`a+b+2ab=0`

Text Solution

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The correct Answer is:
a
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MCGROW HILL PUBLICATION-TRIGONOMETRICAL IDENTITIES AND EQUATIONS -EXERCISE (LEVEL 1 Single Correct Answer Type Questions)
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