Last Activity: 10 Years ago
Start by writing Sin(179) as sin(180-1)and sin(180-1)=sin1Combine them to get (sin 1. sin 2..........sin 89)2 sin 90sin 89=sin(90-1)=cos 1Use this to obtain sin 2x and proceed similarily to combine the corresponding terms from both ends of the series to get the answer.
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Last Activity: 2 Years ago