if `a=2,b=5`,then the value of `a^b-b^a`is

If a=7,\ b=5,\ c=3, then the value of a^2+b^2+c^2-a b-b c-c a\ i s -12 (b) 0 (c) 8 (d) 12

If a^(3)-3a^(2)+5a-17=0 and b^(3)-3b^(2)+5b+11=0 are such that a+b is a real number, then the value of a+b is

If the value of the expression tan((1)/(2)cos^(-1).(2)/(sqrt5)) is in the form of a+sqrtb where a, b in Z , then the value of (a+b)/(b) is

If a^4b^5=1 then the value of log_a(a^5b^4) equals

If a^4b^5=1 then the value of log_a(a^5b^4) equals

If a=2 and b=5, then evaluate a^(b)+b^(a) .

If a/b=4/3, then the value of (6a+4b)/(6a-5b) is (a) -1 (b) 3 (c) 4 (d) 5

If a*b=a^2+b^2, then the value of (4*5)*3 is

If A={1,2,3,4}, B={5,6} then the value of A cup B is

Let a ,b >0, let 5a-b ,2a+b ,a+2b be in A.P. and (b+1)^2, a b+1,(a-1)^2 are in G.P., then the value of (a^(-1)+b^(-1)) is _______.