sin 17°=x/y then the value of (sec17°-sin73°)
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L H S = sec 17 ∘ − sin 73 ∘
= 1 cos 17 ∘ − sin ( 90 ∘ − 17 ∘ )
= 1 cos 17 ∘ − cos 17 ∘
= 1 − cos 2 17 ∘ cos 17 ∘
= sin 2 17√ 1 − sin 2 17 ∘
= x 2 y 2 √ 1 − x 2 y 2
= x 2 y × y √ y 2 − x 2
= x 2 y √ y 2 − x 2
= R H S
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