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If tan theta + sin theta = 1, " then" c...

If ` tan theta + sin theta = 1, " then" cos^(2) theta = n " then" m^(2) -n^(2)` is equal

A

`m^(2) - n^(2) = 4mn`

B

`m^(2) + n^(2) = 4mn`

C

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

D

`m^(2) - n ^(2) = 4 sqrt((mn))`

Text Solution

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The correct Answer is:
D
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