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82问答网 > 特殊角的三角函数表30 45 60 90 120 135 270 180 360 的sin cos tan

特殊角的三角函数表30 45 60 90 120 135 270 180 360 的sin cos tan

2025-03-15 06:51:10

推荐回答（2个）

回答1：

sin 30=1/2；cos 30=根号3/2；tan 30=根号3/3
sin 45=根号2/2；cos 45=根号2/2；tan 45=1
sin 60=根号3/2；cos 60=1/2；tan 60=根号3
sin 90=1；cos 90=0；tan 90=+∞（不存在）
sin 120=根号3/2；cos 120=-1/2；tan 120=-根号3
sin 135=根号2/2；cos 135=-根号2/2；tan 135=-1
sin 270=-1；cos 270=0；tan 270=-∞（不存在）
sin 180=0；cos 180=-1；tan 180=0
sin 360=0；cos 36=1；tan 360=0

回答2：

计算2tan135º+cos90º-tan0º

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