sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/13 07:42:27
sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
=sin120°cos30°+cos60°sin30°+tan135°
=sin60°cos30°+cos60°sin30°+(-tan45°)
=sin(60°+30°)-tan45°
=sin90°-tan45°
=1-1
=0
=sin120°cos30°+cos60°sin30°+tan135°
=sin60°cos30°+cos60°sin30°+(-tan45°)
=sin(60°+30°)-tan45°
=sin90°-tan45°
=1-1
=0
计算不太明白...求值sin(-1320°)*cos1110°+cos(-1020°)sin750°+tan(-405°
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