已知-π/2<x<0,sin x+cos x=1/5求sin 2x+2 sin
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
已知cos(π/2+x)=sin(x-π/2) 求sin^3(π-x)+cos(x+π)/5cos(5π/2-x)+3s
已知 sin a,sin 2x ,cos a 成等差数列,sin a ,sin x ,cos a 成等比数列,求cos
已知sin X+cos X=m,|m|小于等于根号2且|m|不等于1,求sin X^3+cos X^3,sin X^4+
已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)
已知f(x)=cos^2x/1+sin^2x求f'(π/4)
已知COS(π/4-X)=-4/5,求(SIN2X-2SIN^X)/(1+TANX)
求极限 ((sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1
已知cos 2x=3/5,求sin^4 x+cos^4 x的值
已知fx=2/√3sin 2x-2/1[cos^x-sin^x]-1
5sin^2(X)+sin(2X)-cos^2(X)=1, 求解X
已知函数f(x)=sin(2x+π/3)+sin(2x-π/3)+2cos^2x-1