do this .................
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In this question we rationalize the denominator in order to remove square root.
Taking L.H.S,
= √1+CosØ/1-CosØ
Rationlising the denominator....
= √1+CosØ/1-CosØ × 1+CosØ/1+CosØ
= √(1+CosØ)²/1-Cos²Ø
= √(1+CosØ)²/Sin²Ø
= 1+CosØ/SinØ
= 1/SinØ + CosØ/SinØ
= CosecØ + CotØ
Proved.....
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Hey mate please refer to the attachment
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