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Prove that, 2 "cosec" 4 theta - sec2 the...

Prove that, `2 "cosec" 4 theta - sec2 theta = (1- tan theta)/(1+tan theta)"cosec" 2 theta`

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The correct Answer is:
`=(1-tan theta)/(1+tan theta) "cosec"2 theta = R.H.S`
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