sin21°+sin22°…+sin288°+sin289°=44124412
sin21°+sin22°…+sin288°+sin289°=44124412....
sin21°+sin22°…+sin288°+sin289°=44124412.
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杰出且淡雅的瑰宝9192
2014-10-19
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sin
2l°+sin
22°+…+sin
288°+sin
289°
=(sin
2l°+sin
289°)+(sin
22°+sin
288°)+…+(sin
244°+sin
246°)+sin
245°
=1+1+…+1+
=44
.
故答案为44
.
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