设sin（45-x）=5/13,0

设sin（45-x）=5/13,0 设f(x)=sin(cosx),(0 设f(X)=sin(cosX),(0 设f（x）={x^sin(1/x),x>0 a+e^x,x 设函数f(x)=sin(2x+φ)(0 1.设函数f(x)=sin(x+fai)(0 设sin(π/4-x)=5/13,则cos2x/cos(π/4+x)=_______ 设sin(π/4-x)=5/13,则cos2x/cos(π/4-x)=_______ 设函数f（x,y)=sin(x+y),那么f(0,xy）=( ) 设f可导,y=sin{f[sin（x）]}且f（0）=0,求y'(0) 设函数fx=sin( φ-2x)(0 设函数y=3sin(2x+φ)（0 设函数f（x）=sin(ax+q) (-兀 设(2cosx-sinx)(sin^2x+2cos^2x)=0,则(2cos^2x+sin^2x)/(1+tanx）等于多少 设函数f（x）=sin（wx+φ）（w>0,-π/2 设sin（xy）-x^2y=0,求dy／dx,求导什么的都要疯了! 设X属于（0,90度）,求y=[2sin^2(X)+1]/[sin(2X)]的最小值用三角恒等变换的知识答, 设f(0)=0,f'(0)=2,求limf（x）/sin 2x ,x 趋向于0