sec² ∅ + cosec² ∅ = sec² ∅ × cosec² ∅.( prove L.H.S. = R.H.S. )
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L.H.S. =sec
2 A+cosec 2A
⇒ cos 2A1 + sin 2 A1
⇒ sin 2 Acos 2 Asin 2 A+cos 2A
⇒ sin 2 Acos
2 A1
⇒cosec 2 Asec 2
A= R.H.S.
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