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sin(3兀/4)等于多少???

0.411

sin3分之4π=-sin3分之π=-2分之根号3

3π/4是135°,cot(3π/4)=-1

sin3/4π=sin(π-3/4π)=sinπ/4=(√2)/2 (这个就是45度的sin值)

√2/2 解析:sin(3π/4)=sin(π-3π/4)=sin(π/4)=√2/2

sin三分之四π=sin(π/3+π)=-sinπ/3=-根号3/2 满意请及时采纳

sin(3π/4)=sin(π/2+π/4)=cos(π/4)=√2/2

sin(3π/4)=sin(π-π/4)=sin(π/4)=√2/2cos(3π/4)=cos(π-π/4)=-cos(π/4)=-√2/2tan(3π/4)=sin(3π/4)/cos(3π/4)=-1

cos(3π/4)=cos(π-π/4)=-cosπ/4=-√2/2

负二分之根号二

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