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If tan theta=(sin alpha- cos alpha)/(sin...

If `tan theta=(sin alpha- cos alpha)/(sin alpha+cos alpha)`, then `sin alpha+cos alpha`=.................... A) `sqrt2 cos, theta sqrt2 sintheta ` B) `-sqrt2 sin theta, -sqrt2 cos theta ` C) `sqrt2 sin theta , sqrt2 sin theta ` D) `sqrt2 cos theta , - sqrt2 cos theta `

A

`sqrt2 cos, theta sqrt2 sintheta `

B

`-sqrt2 sin theta, -sqrt2 cos theta `

C

`sqrt2 sin theta , sqrt2 sin theta `

D

`sqrt2 cos theta , - sqrt2 cos theta `

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The correct Answer is:
A
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