Answer :
sin 50° - sin 70° + sin 10°
= (sin 50° + sin 10°) – sin 70°
= 2sin 30° cos 20° - sin (90° - 20°)
= 2 ⋅ 1/2 ⋅ cos 20° - cos 20°
= cos 20° - cos 20°
= 0
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