若x是锐角,且满足sin(x-pai/6)=1/3,则cosx等于多少
若sin(pai/6-x)=1/3,则cos(2pai/3+2x)=?
若a是锐角,且满足sin(a-π/6)=1/3,则sina 的值为多少?
若a是锐角,且满足sin(a-π/6)=1/3,则cos a 的值为多少?
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
COSX=-1/3 且PAI/2〈x〈PAI/2 则 COS(X/2)=?
sin(x-2pai)-cos(pai-x)=(1-根号3)/2,x是第二象限的角.求:(1)sinx与cosx的值(2
若sin(pai-x)=log8 (1/4),且x属于(-pai/2,0),则cos(2pai-x)的值是多少
sin(x-pi/6)=1/3 求cosx X为锐角
已知x为锐角且cosx等于1/3求cosx/1+sinx的值
cosx -(根号3)*sinx这道题的答案是-2sin(x +pai /3)还是2sin(x +pai /3)
满足sin(x+sinx)=cos(x-cosx)的锐角x=?
满足sin(x+sinx)=cos(x-cosx)的锐角x为几