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If tan\ theta/2=cosectheta-sintheta, the...

If `tan\ theta/2=cosectheta-sintheta,` then- a.`sin^2\ theta/2=2sin^2\ 18^@` b. `cos2theta+2costheta+1=0` c.`sin\ theta/2=4sin^2\ 18^@` d. `cos2theta+2costheta-1=0`

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ALLEN-TRIGONOMETRIC RATIOS AND IDENTITIES-All Questions
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  7. 4\ cos\ 20^0\ -sqrt(3)\ cot\ 20^0\ =

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