" 2) "a^(2)-b^(2)-a-b

15. "a^(2)-b^(2)-a-b

Factorise : a^(2) - b^(2) - 2b -1

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

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

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

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

Factorise : a^2-b^2-a-b

If : sin theta = (a^(2)-b^(2))/(a^(2)+b^(2)), "then" : cot theta= A) (4a^(2)b^(2))/(a^(2) -b^(2)) B) (a^(2) + b^(2))/(a^(2) - b^(2)) C) (4a^(2)b^(2))/(a^(2) + b^(2)) D)none of these.

If cos theta+sin theta=a,cos2 theta=b, then (a)a^(2)=b^(2)(2-a^(2))(b)b^(2)=a^(2)(2-b^(2))(c)b^(2)=a^(2)(2-a^(2))(d)a^(2)=b^(2)(2-b^(2))

The sum of (a)/(a^(2)-b^(2)) and (b)/(a^(2)-b^(2)) is