已知sin
(x+)＝，求sin
(−x)+sin2(−x)的值．
人气：287 ℃ 时间：2020-04-05 15:36:30
解答
∵
sin(x+)＝∴
sin(x−)+ sin2(−x)=sin
[π−(x+)]+sin2[−( +x)]=
sin(x+)+cos2(x+)=
+=
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