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sum(k=0)^5(1)/(sin[(K+1)theta]sin[(K+2)t...

` sum_(k=0)^5(1)/(sin[(K+1)theta]sin[(K+2)theta])` can be equal to

A

`(cot2theta-cot7theta)/(sin theta)`

B

`(tan2theta-tan7theta)/(sin2theta)`

C

a positive number

D

a negative number

Text Solution

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The correct Answer is:
A, C, D
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