A.y=sin(1/2)π B.y=cos2xC.y=1+sin3x D.y=cos3X

A.y=sin(1/2)π B.y=cos2xC.y=1+sin3x D.y=cos3X 求证1、sin l-sin y=2cos（l+y)/2 sin（l-y）/22、cos l+cos y=2cos（l+y）/2 cos（l+y)/23、cos l-cos y=-2sin (l+y)/2 sin (l-y)/24、tanatan2a/(tan2a-tana)+根号3（sin²a-cos²a）=2sin(2a-π/3)对了,还有：是否存在锐角l,y, 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 下列函数中,既为偶函数又在(0,π/2)内递增且是周期函数的是A y=sin x B y=cos x C y=sin|x| D y=|sin x| 下列函数中为奇函数的是( ) A.y=sin平方x,B.y=2sinx,C,y=1+x,D.y=cosx. 已知x+y=根号2sin(a+π/4),x-y=根号2sin(a-π/4),求证x^2+y^2=1 已知x+y=根号2sin(a+π/4),x-y=根号2sin(a-π/4),求证x^2+y^2=1 函数y=sin（ax+b）（a>0,|b| 函数y=a+b sin X （b y=sin(2x+a)(0 y=sin(2x+a)（0 已知直线y=kx+1与曲线y=sin^3(x)+ax+b切于点(π/4,2),求a,b,k的值. 已知(x/a)cosθ+(y/b)sinθ=1,(x/a)sinθ-(y/b)cosθ=1,求证(x^2/a^2)+(y^2/b^2)=2如题示. 下列函数中,周期为π为偶函数是,A y=sin2x B y=sin4y-cos4x Cy=cosx/2 Dy=sinx+co 将函数f(x)=sin(2x-π/3)的图像左移π/3,在讲图像上各点横坐标压缩到原来的1/2,则所得的图像的解析式为：A.y=sinx B.y=sin(4x+π/3)C.y=sin(4x-2π/3) D.y=sin(x+π/3) 已知3sin^2a+2sin^2b-2sina=0,则y=sin^2a+sin^2b的最大值? 函数y=(cos x+sin x)/(cos x-sin x)的最小正周期是多少?A.1 B π/2 C 2π D π 证明Acosx+Bsinx=[根号（A^2+B^2)]*sin(x+y),其中y=arctan(A/B)