tan-1(1-x2+tan-1(2+x))=π/4
函数f(x)=cosx+(x+1)sinx+1在区间[0,2π]的最小值、最大值分别为【 】
已知cosx=(1-(M+1)sin2x)/(1+(M-1)sin2x),求x的值.
英:Solute the equation汉:解方程sin4θ+sinθ=0
Find all the positive angles less than 380° which satisfy the equation sinx+sin2xsin3x = 0.
Find all the positive angles less than 360° which satisfy the equation:cos2x+cosx+1=0