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If cot theta+costheta=m and cot theta-co...

If `cot theta+costheta=m and cot theta-costheta=n`, then find the value of `m^(2)-n^(2)`.

A

a) `sqrt(mn)`

B

b) `2sqrt(mn)`

C

c) `3sqrt(mn)`

D

d) `4sqrt(mn)`

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The correct Answer is:
D
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