If `cos^(-1)x/a+cos^(-1)y/b=alpha,` prove that `(x^2)/(a^2)-2(x y)/(a b)cosalpha+(y^2)/(b^2)=sin^2alpha`

If cos^-1(x//a)+cos^-1(y//b)=alpha , Prove that x^2/a^2-(2xy)/(ab)cosalpha+y^2/b^2=sin^2alpha

If cos^(-1)(x/a) + cos^(-1) (y/b) = alpha show that : (x^2)/(a^2) - (2xy)/(ab) cos alpha + (y^2)/(b^2) = sin^(2) alpha .

If cos^(-1)(x/a) + cos^(-1) (y/b) = a show that : (x^2)/(a^2) - (2xy)/(ab) cos alpha + (y^2)/(b^2) = sin^(2) alpha .

If "sin"^(-1)(x/a) + "sin"^(-1) (y/b)=alpha "prove that" x^2/a^2+(2xy)/(ab) "cos" alpha+y^2/b^2 ="sin"^2 alpha

If "cos"^(-1) x/a +"cos"^(-1) y/b=alpha , then : x^2/a^2 -(2xy)/(ab) cos alpha + y^2/b^2 equals :

if cos ^(-1 ) ""(x )/(a) + cos ^(-1 )""(y)/(b ) = alpha prove that , (x^(2) )/(a^(2)) -(2xy)/(ab ) ""cos alpha +(y^(2))/(b^(2))= sin ^(2) alpha

If cos^(-1)((x)/(2))+cos^(-1)((y)/(3))=alpha then prove that 9x^(2)-12xy cos alpha+4y^(2)=36sin^(2)alpha

If cos^-1 x/a + cos^-1 y/b = alpha , then show x^2/a^2 + y^2/b^2 - (2xy)/ab cos alpha = sin^2 alpha

If cos^(-1)x-cos^(-1)y=alpha, then x^(2)+y^(2)-2xy cos alpha is equal to

If cos^(-1)x-cos^(-1)y/2=alpha,t h e n4x^2-4x ycosalpha+y^2 is equal to (a)4 (b) 2sin^2alpha (c) -4sin^2alpha (d) 4sin^2alpha