asin^2x+bcos^2x=m,asin^2x+b(1-sin^2x)=m,得sin^2x=（m-b)/(a-b),cos^2x=(m-a)/(b-a);bsin^2y+acos^2y=n,bsin^2y+a(1-sin^2y)=n,得 sin^2y=（n-a)/((b-a); cos^2y=(n-b)/(a-b)atanx=btany;a^2sin^2x/cos^2x=b^2sin^...