[" If "A=[[2,2],[a,b]]" and "A^(2)=O" ,then "(a,b)=],[[" (A) "(-2,-2)," (B) "(2,-2)," (C) "(-2,2)," (D) "(2,2)]]

" If "AB=A,BA=B" then "A^(2)+B^(2)=[[" (A) ",A+B],[" (B) ",A-B],[" (C) ",AB],[" (D) ",O]]

If A and B are square matrices of the same order such that A^(2)= A, B^(2) = B, AB = BA = O , then a) (A - B)^(2) = B - A b) (A- B)^(2) = A - B c) (A + B)^(2) = A + B d)None of these

If acottheta+b"c o s e c"theta=p and bcottheta+a"c o s e c"theta=q , then p^2-q^2= (a) a^2-b^2 (b) b^2-a^2 (c) a^2+b^2 (d) b-a

B_(2)O_(3) is

If sin(A-B) = 1/2 and cos(A+B) = 1/2 , 0^o B, then find A and B.

In the reaction B (OH)_(2).2H_(2)Oto[B(OH)_(2)]^(-)+2H_(2)O^(+) . [B(OH)_(2)]^(-) is

If x = a sec O/ and y = b tan O/ then prove that x^2/a^2 - y^2/b^2 = 1