为什么.sin(兀/2+△x)-sin兀/2 =cos△x-1
sin(兀/2+△x)-sin兀/2 =cos△x-1为什么
为什么.sin(兀/2+△x)-sin兀/2 =cos△x-1
sin(x+△x)-sinx=2sin△x/2.cos(x+△x/2)
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
为什么y = x - sin(x/2)cos(x/2) = x - (1/2)sin(x) 其中sin(x/2)cos(
2cos x (sin x -cos x)+1
(1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x
化简 1/2cos x-根号3/2sin x 根3sin x+cos x
关于三角函数,sin(x/2)cos(x/2 兀/3) cos(x/2)sin(x/2 兀/3)=sin(x x 兀/3
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
三角化简sin(x-5兀)cos[(-兀/2)-x]cos(8兀-x)/sin[x-(3兀/2)]sin(-x-4兀)