f(x)=sin(270°-a)+sina ,且f(x)=负五分之一,当2a在第三象限时 求tan2a急

如果f(cos x)=sin 3x,那么f(sin x)等于A.sin 3x B.-sin 3x Ccos 3x D-cos 3x C语言求三角函数f(x,y,z)=sin(x)/(sin(x-y)*sin(x-z))+sin(y)/(sin(y-x)*sin(y-z))+sin(z)/(sin(z-x)*sin(z-y))代码#include #include double fun(double x,double y,double z){double a,b,c,sum;a=sin(x)/(sin(x-y)*sin(x-z));b=sin(y)/(sin(y-x)*sin(y-z));c 已知f(x)=sin 已知函数f x=a(2sin ²x/2+sin x)+b 函数f(x)=A*sin(ax+b)*sin(ax+b)(A>0,a>0,0 如果函数f(x)=sin(πx+a)(0 函数f(x)=sin(2x+a) -π 如果函数f(x)=sin(π x+A)(0 函数f(x)=sin(2x+a）(-π 求f(x)=sin(2x+a)的奇偶性 已知f(x)=sin(a+x)+sin(a-x)-2sina对任意实数x总有f(x)≥0成立,且tan2a=-0.75,a∈(0°,270°)5求sina+cosa的值 .若f(x)=sinα－cosx,则f′(α)等于 A.sinα B.cosα C.sinα+cosα D.2sinα 求函数f(x)=sin(x+20°)+sin(x+80°)的最值 f(x)=3sin(x-20°)+5sin(x+40°)的最大值 函数f(x)=负根号3sin ^2x+sin x cos x f(a/2)=1/4-根号3/2求sin a值 已知f(x)=sin(wx+a)(w>0,0 已知f(x)=sin(wx+a)(0 设函数f(x)=sin(2x+a)(-180°