Cot∅+tan∅=sec∅ cosec∅
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=> cotΦ + tanΦ = secΦ cosecΦ
=> 1/tanΦ + tanΦ
=> 1 + tan^2Φ/ tanΦ ( 1 + tan^2Φ = sec^2Φ )
=> sec^2Φ * cosΦ/ sinΦ
=> sec^2Φ * 1/secΦ/ sinΦ
=> secΦ cosecΦ ( 1/sinΦ = cosecΦ )
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