求几个三角函数值sin(-5pai/3)cos(-11pai/9)cos(-104度26分)tan(632度24分)ta
计算下列三角函数值!sin(-7/6pai) cos(5/4pai) tan(-16/3pai)
[tan(pai-a)cos(2pai-a)sin(-a+3pai/2)]/[cos(-a-pai)sin(-pai-a
化简:[cos(a+pai)*sin^2(a+pai)]/[tan^2(pai+a)*cos^3a]
f(a)=[sin(pai-a)cos(2pai-a)tan(-a+3pai/2)]/[cos(-pai-a)]则f(-
已知tana=2,求sin(pai-a)cos(2pai-a)sin(-a+3/2pai)/tan(-a-pai)sin
已知cos (a+pai /3)=sin (a-pai /3),则tan a的值是
已知cos(3pai/2-a)=2根号5/5,a属于(pai,3pai/2) 求tan(pai/4+2a)的值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/
已知cos(a-pai/6)+sina=4根3/5,求sin(a+7pai/6)的值
化简sin(-2/3pai+kpai)cos(pai/6+kpai)tan(pai/4+kpai),k属于z
已知sin(x-pai/4)=根号2/10,X属于(pai,5pai/4) 求sinx得值.求cos(2x-pai/6)
已知:cos(x-pai/4)=根号2/10,x属于pai/2,3pai/4,求sin(2x+pai/3)的值