" 30."ab(x^(2)+y^(2))-xy(a^(2)+b^(2))

Factorise : (vi) ab (x^(2) + y^(2) ) - xy (a^(2) + b^(2) )

Fractorise: ab (x ^(2) + y^(2) ) + xy (a^(2) + b ^(2)).

Factorise: ab (x ^(2) + y ^(2)) - xy (a ^(2) + b ^(2))

If (x+1)/(x-1)=(a)/(b) and (1-y)/(1+y)=(b)/(a), then the value of (x-y)/(1+xy) is (2ab)/(a^(2)-b^(2)) (b) (a^(2)-b^(2))/(2ab) (c) (a^(2)+b^(2))/(2ab) (d) (a^(2)-b^(2)backslash)/(ab)

If a=(x)/(x+y) and b=(y)/(x-y), then (ab)/(a+b) is equal to (a) (xy)/(x^(2)+y^(2)) (b) (x^(2)+y^(2))/(xy)( c) (x)/(x+y) (d) ((y)/(x+y))^(2)

If cos^(-1)(x/a)+cos^(-1)(y/b)=theta ,then the value of sqrt((x^(2))/(a^(2))+(y^(2))/(b^(2))-(2xy)/(ab)cos theta) is equal to

Factorize each of the following expressions: x^(2)+2xy+y^(2)-a^(2)+2ab-b^(2)

If cos^(-1) . x/a - sin^(-1). y/b = theta (a , b , ne 0) , then the maximum value of b^(2) x^(2) + a^(2) y^(2) + 2ab xy sin theta equals