sin690°Xsin150°+cos930°Xcos( -270°)+tan120°Xtan1050°求解!
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/27 19:36:43
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sin690°Xsin150°+cos930°Xcos( -270°)+tan120°Xtan1050°求解!
sin690°=
cos585°/tan495°+sin690°的值是多少?
sin39°-sin30°cos9°/cos39°-cos30°cos9°
化简：sin690°sin150°+cos930°cos（-870°）+tan120°tan1050°
sin21°cos81°-sin69°cos9°
求值：sin21°cos81°-sin69°cos9°
cos54°cos9°+sin54°cos81°
sin21°cos9°+cos21°sin9°=?
cos39°cos9°+sin39°sin9°=
cos51°cos9°-cos39°sin9°=
化简COS8°-SIN17°SIN9°/COS9°
化简COS8°-SIN17°SIN9°/COS9°
试比较sin11°和cos9°的大小
求值:(sin9°+sin6°cos15°)/(cos9°-sin6°sin15°)怎么做? 过程!
计算：(sin9°+cos15°sin6°)÷(cos9°-sin15°sin6°)
求sin(-1200°）×cos1290°+cos9-1020°)×sin（-1500°）+tan945°
求sin(-1200°）×cos1290°+cos9-1020°)×sin（-1500°）+tan95°