sin(x+15°)=1/3 则cos(x+105°)=?

sin(x+15°)=1/3 则cos(x+105°)=? 若cos x-sin x = 0.5,则cos^3 x-sin^3 x = 若sin x/2 - cos x/2 = 1/3,则sin x=? 若sin x/2-cos x/2=1/3,则sin x= 已知(1+sin x)/cos x=-1/2,则cos/(sin x-1)=? 若cos(x+y)cos(x-y)=1/3,则cos^x-sin^y=?^为平方 Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) 1/cos(x) - tan(x) = 3 求sin(x)1/cos(x) - tan(x) = 3求sin(x) 求证(3-sin^4 x-cos^4 x)/2cos^2 x=1+tan^2 x+sin^2 x 已知cos（75°+X）=1/3,X在第三象限,求cos（15°-X）+sin（X-15°）的值 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 解方程：cos^3x-sin^3x=1 求方程 sin^3x+cos^5x=1 若SIN X*COS X =1/3,已知0 (1+cos x-sin x)/(1-sin x-cos x)+(1-cos x-sin x)/(1-sin x+cos x)=? 已知sin (x-3pai /4)cos (x-pai /4)=-1/4,则cos 4x 的值等于 已知cos x/（sin x-1）=1/2,则（1+sin x）/cos x等于? tanx=m,则{sin(x+3π）+cos(π+x)}/{sin(-x)-cos(π+x）}=?