sin(a+b)=?

来源：百度知道编辑：UC知道时间：2024/09/24 07:00:43

sin(a+b)=?
这个公式是等于什么
sin(a-b)=?
cos(a+b)=?
cos(a-b)=?

两角和公式
sin(A+B) = sinAcosB+cosAsinB
sin(A-B) = sinAcosB-cosAsinB ?
cos(A+B) = cosAcosB-sinAsinB
cos(A-B) = cosAcosB+sinAsinB
tan(A+B) = (tanA+tanB)/(1-tanAtanB)
tan(A-B) = (tanA-tanB)/(1+tanAtanB)
cot(A+B) = (cotAcotB-1)/(cotB+cotA) ?
cot(A-B) = (cotAcotB+1)/(cotB-cotA)

sin(a+b)=sinacosb+cosasinb

sin(a-b)=sinacosb-cosasinb

cos(a+b)=cosacosb-sinasinb

cos(a-b)=cosacosb+sinasinb

sin(a+b)=sinacosb+sinbcosa
sin(a-b)=sinacosb-sinbcosa
cos(a+b)=cosacosb-sinasinb
cos(a-b)=cosacosb+sinasinb

设A，B为锐角，且sin^2A+sin^B=sin(A+B),求证A+B＝90 （b+c);(a+b);(a+c)=4:5:6,求sin A ,sin B,sinc 以知 sin=4sin(a+b) sin^2a+sin^2b=sin^2c 求角b得大小？三角形ABC中,(a^2+b^2)sin(A-B)=(a^2-b^2)sin(A+B) 证明sin(a+b)sin(a-b)=(sina+sinb)(sina-sinb) 在三角形ABC中,sin*2A+sin*2B=sin*2C sin(2A)+sin(2B)+sin(2C)=4sinAsinBsinC 若锐角a,b满足sin a-sin b=-0.5,cos a-cos b=1/3,求sin(a+b)的值求证(a^2+b^2)/c^2=(sin^2A+sin^2B)/sin^2C