prove that:- 1)sin 19°+sin 41°+sin83°=sin 23°+sin37°+sin79°. & 2)cos 10°cos 20°+sin 45°cos 145°+sin 55°cos 245°=0 ....pls solve it fast....
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prove that:- 1)sin 19°+sin 41°+sin83°=sin 23°+sin37°+sin79°. & 2)cos 10°cos 20°+sin 45°cos 145°+sin 55°cos 245°=0 ....pls solve it fast
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