化简cos(a-B)cos(a-y)-sin(a-B)sin(y-a)
sin(a+B)cos(y-B)-cos(B+a)sin(B-y) 化简
cos(a+b)+cos(a-b)/sin(a+b)+sin(a-b)化简
三角函数的化简问题sin(a+b)cos(y-b)-cos(b+a)sin(b-y)在这里书上的解答是:sin(a+b)
已知A(cos x,sin x)B(cos y,sin y)(cos z,sinz)O为原点.
化简 sin^4a-cos^4b
求下列函数的导数 Y=a*sin(b) Y=a*cos(b)
由cos(a+b)=cos a cos b-sin a sin b cos(a-b)=cos a cos b+sin a
已知sin A+sinB +siny=0 ,cos A+cos B+cosy=0,求cos(B -y)的值.
cos(a+b)=cos(a)*cos(b)-sin(a)*sin(b) 用三角形证明
已知(x/a)cosθ+(y/b)sinθ=1,(x/a)sinθ-(y/b)cosθ=1,求证(x^2/a^2)+(y
化简[sin(2A+B)]/sinA-2cos(A+B)
化简:cos(A-B)cosB-sin(A-B)sinB