sin(30.+x)=1/3,cos(120.-2x)的值是?
sin(30.+x)=1/3,cos(120.-2x)的值是?
已知(1+sin x)/cos x=1/2,则cos x/(sin x-1)的值是
y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
已知cos 2x=3/5,求sin^4 x+cos^4 x的值
sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值
函数f(x)=(sin x-1)/(3-2cos x-2sin x)^(1/2) (0≤x≤2π) 的值域是( )
设x是第二象限角,cos(x/2)+sin(x/2)=负根号5除以2,求sin(x/2)-cos(x/2)的值
函数f(x)=sin^2x+3cos^x的最小正周期是?
已知tanx=2,(1)求2/3sin^2x+1/4cos^2x的值(2)求2sin^2x-sinxcosx+cos^2
求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x).
函数y=sin^2x+sin x cos x的值域是?
SINx-COSx=1/2求SIN*3x-COS*3x的值?