下列各式中正确是A.sin(-7π/6)0 C.tan4π/3>0 D.cos(-π/6)
1个回答
C
画出图像就知道了
相关问题
求值:2cosπ/2-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6+sin3π/
计算:cox(π/3)-tan(π/4)+(3/4)tan(π/6)-sin(π/6)+cos(π/6)...
计算sin(-7π/2)+tanπ-2cos0+tan9π/4-sin7π/3
sin-3π/4= cos11π/6= tan13π/4= sin7π/2= cos-3π/2= sin10π/3=
cos9π/4+tan(-7π/6)+sin21π?、
化简a²sin3/π+b²cosπ/6-absinπ/4cosπ/4tanπ/3+abcosπ/6= 过 程
求值sin7π/3cos(-23π/6)+tan(-11π/4)cos13π/3
tan(a-4π)cos(π+a)sin^2(a+3π)/tan(3π+a)cos^2(2/5π+2)=0.5,求tan
sin[25π/6]+cos[25π/3]+tan(-[25π/4])=______.
sin(-21π/4) cos(-20π/3) tan(-19π/6)=