" 16.If "cos^(-1)(p)/(a)+cos^(-1)(q)/(b)=alpha" then Prove that "(p^(2))/(a^(2))-(2pq)/(ab)cos alpha+(q^(2))/(b^(2))=sin^(2)alpha

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

cos^(-1)((p)/(a))+cos^(-1)((q)/(b))=alpha then (p^(2))/(a^(2))-(2pq)/(ab)+(q^(2))/(b^(2)) equals

If cos^(-1)((p)/(a))+cos^(-1)((q)/(b))=alpha and (p^(2))/(a^(2))+k cos alpha+(q^(2))/(b^(2))=sin^(2)alpha then k=

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 "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 show x^2/a^2 + y^2/b^2 - (2xy)/ab cos alpha = sin^2 alpha