(a+b)^(2)-(a-b)^(2)

If vec a and vec b are two vectors,then prove that (vec a xxvec b)^(2)=a^(2)b^(2)-(a.b)^(2)

Factorise : a^(2) - b^(2) - (a+b)^(2)

Show that (a - b)^(2), (a^(2) + b^(2)) " and " (a + b)^(2) are in AP.

Evaluate ((a)/(2b)+(2b)/(a))^(2)-((a)/(2b)-(2b)/(a))^(2)-4 .

(a+2b)^2-(a-2b)^2 is equal to: (a+2b)^2-(a-2b)^2 का मान है :

If a,b,c are in H.P , b,c,d are in G.P and c,d,e are in A.P. , then the value of e is (a) (ab^(2))/((2a-b)^(2)) (b) (a^(2)b)/((2a-b)^(2)) (c) (a^(2)b^(2))/((2a-b)^(2)) (d) None of these