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If cos theta + sin theta =a , " then "...

If ` cos theta + sin theta =a , " then " sin 2 theta = `

A

`a^(2) + 1`

B

`a^(2) - 1`

C

`a^(2)`

D

1

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 C ( MULTIPLE AND SUBMULTIPLE ANGLES )
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  10. tan A + cot 2A=

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