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Cos135度等于多少

cos135° = -√2/2

sin30°=1/2, cos30°=√3/2, tan30°=√3/3, cot30°=√3;sin45°=√2/2, cos45°=√2/2, tan45°=1, cot45°=1;sin60°=√3/2, cos60°=1/2, tan60°=√3, cot60°=√3/3;sin90°=1, cos90°=0, tan90°不存在, cot90°=0;sin135°=√2/2, cos135°=-√2/2, tan

负二分之根号二

-2分之根号2

不相等-cos135° = -√2/2 cos(-135°)=√2/2 cos(-a)=cosa

Cos135°=cos(180°-45°) =-cos45°(第二象限的角) =-√2/2 Sin135°=sin(180°-45°) =sin45° = √2/2cos75°=cos(45°+30°) =cos45cos30-sin45sin30 =√2/2*√3/2-√2/2*1/2 =√6/4-√2/4 =(√6-√2)/4Sin75=sin(45+30) =sin45cos30+cos45sin30 =√2/2*√3/2+√2/2*1/2 =√6/4+√2/4 = (√6+√2)/4

COS135度等于负0,99608

sin135度=sin(180-135)=sin45=(√2)/2; cos135度=-cos(180-135)=-cos45=-(√2)/2; tan135度=sin135/cos135=-1.

cos135°=cos(180°-45°)=-cos45°=-√2/2

cos135°=-√2/2sin135°=√2/2

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