sin 50° 40° 20°/cos 39° 19° 40°
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Answer:
LHS=(sin10+sin50)+(sin20+sin40)
=(2sin 30cos 20)+(2sin 30cos 10)
=2sin 30(cos10+cos20)
=2×1/2 (sin80+sin70)
=sin70+sin80=RHS
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