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sin(π+π/6)-cos(π+π/4)cos(-π/2)+1
求值
人气:346 ℃ 时间:2020-04-29 11:09:10
解答
sin(π+π/6)-cos(π+π/4)cos(-π/2)+1
=-sin(π/6)+cos(π/4)cos(+π/2)+1
=-1/2+cos(π/4)*0+1
=1/2
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