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)
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)
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
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
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
已知函数f(x)=cos(2x-兀/3)+2sin(x-兀/4)sin(x+兀/4).(1).求函数f(x)的最小正周期
(1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x
求函数f(x)=5根号3cos^2x 根号3sin^2x-4sinxcosx(兀/4
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x).
设f(x)=sin兀x(x=0),g(x)=cos兀x(x=1/2)