Sin 85° - sin 35°- cos65º =
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Step-by-step explanation:
sneaky....85 = 60 + 25 , 35 = 60 - 25...thus top is 2 cos 60 sin 25...{ sin (a±b) used }
but sin 25 ≡ cos 65....so upon division you are left with 2 cos 60 ≡ 1
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