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Verified answer
√((1 + cos x)/(1 - cos x)= √((1 + cos x)(1 + cos x)/(1 - cos x)(1 + cos x))
= √((1 + cos x)²/(1 - cos² x))
= √((1 + cos x)/(sin x))²
= (1 + cos x) / sin x ✔
Verified answer
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