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If sin theta + costheta = m and sin the...

If `sin theta + costheta = m ` and `sin theta - cos theta = n ` , then

A

`m^(2) + n^(2) = 1`

B

`m^(2) - n^(2) = 1`

C

`m^(2) + n^(2) = 2 `

D

`m^(2) - n^(2) = 2 `

Text Solution

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The correct Answer is:
C
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