A=(cosa,sina),B=(cosb,sinb),A,B满足(kA+B)的模等于根号3倍(A-kB)的模,K>0,将A与B的数量积用k表示
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求证:cos(a+b)=cosa*cosb-sina*sinb
证明:cos(a+b)=cosa×cosb-sina×sinb
证明(1-cos^2a)/(sina+cosa)-(sina+cosa)/(tan^2a-1)=sina+cosa
求证(1-cos²a/sina-cosa)-(sina+cosa/tan²a-1)=sina+cosa
cosb=cos[(a+b)-a]=cos(a+b)cosa+sin(a+b)sina
证明(1-cos^2a)/(sina-cosa)-(sina+cosa)/(tan^2-1)=sina+cosa
已知cos(a-b)=3/1,求(sina+sinb)(sina+sinb)+(cosa+cosb)(cosa+cosb)=
若sina+sinb=1,cosa+cosb=o求cos^2a+cos^2b
a,b为锐角 且cos(a+b)=sin(a-b),则sina-cosa=
sin(a+b)cosa-cos(a+b)sina=5/13 则sin(π-B)=?
已知sin a+cos a=1/2 sina*cosa=?cos a/sina+sina/cosa=?
求证:1-cos^2a/sina-cosa - sina+cosa/tan^2a-1=sina+cosa
已知两向量a=(2,sina),b=(1,cos)若a//b,求sina+2cosa/2sina-3cosa的值
已知sin(A-B)cosA-cos(A-B)sinA=3/5,cos2B=?
cos(A+B)sinA-sin(A+B)cosA=3/4,则cos2A=?
sina+sinb=a,cosa+cosb=b,ab不等于0,cos(a-b)等于
sin(a-b)cosa-cos(a-b)sina=3/5求cos2b
已知sin(a-b)cosa-cos(a-b)sina=0.6 那么cos2b为多少