看脱发哪个医院好:求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x)
来源:百度文库 编辑:查人人中国名人网 时间:2024/07/08 12:12:11
两角和正切公式:
tan[(x-y)+(y-z)]=[tan(x-y)+tan(y-z)]/[1-tan(x-y)tan(y-z)]
tan(x-y)+tan(y-z)
=tan(x-y+y-z)*[1-tan(x-y)tan(y-z)]
=tan(x-z)*[1-tan(x-y)tan(y-z)]
=tan(x-z)-tan(x-z)tan(x-y)tan(y-z)
=-tan(z-x)+tan(z-x)tan(x-y)tan(y-z)
tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-z)tan(z-x)
求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x)
7sinx=3sin(x+y) 求证:2tan[(2x+y)/2]=5tan(y/2)
tan(x+y)=0.4,tan(y-45°)=0.25,则tan(x+45°)=?要过程
已知x,y,z为正实数,y*y=x*z,求证:x*x+y*y+z*z>(x-y+z)*(x-y+z)
y=tan(x/2+pi/3)?
5cos(x-y/2)+7cos(y/2)=0求tan(x/2)*tan[(x-y)/2]
设x.y.z满足3x=4y=6z(x.y.z都是指数)求证
求证:tanA+B/2*tanA-B/2=tan(y/2)^2
求 y=tan A-sinA
y=tan(sinx)的周期是多少?