(cosecA-cotA)wholepower2 = 1-cosA ÷1+cosA
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Hey there!
L.H.S:
= ( cosec Ф - cot Ф)²
= ( 1 / sinФ + cosФ/sinФ)²
= (1 - cosФ)² / sin² Ф { ∵ sin²Ф = 1 - cos²Ф}
= (1 - cosФ)² / ( 1 - cos²Ф)
= [ (1 - cosФ) ( 1 - cosФ) ] / ( 1 + cos Ф) ( 1 - cosФ))
= ( 1 - cosФ) / ( 1 + cosФ)
= R.H.S
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