Fill `(a-1/a)^2=a^2-.........+1/a^2`

Fill in the blanks. (1) -2a^3b is a........ (2) (a^2-2b^2) is a ....... (3) (a+2b-3c) is a .......... (4) In -5ab , the coefficient of a is ...... (5) In x^2+2x-5 ,the........term is -5

If a^(2)-2a-1=0, then find a-(1)/(a),a+(1)/(a),a^(2)+(1)/(a^(2)) and a^(2)-(1)/(a^(2))

1/(2^2-1)+1/(4^2-1)+1/(6^2-1)+...oo=1/2

What is sqrt(1 + 1/1^(2) + 1/2^(2)) + sqrt(1 + 1/2^(2) + 1/3^(2)) +.... + sqrt(1+ 1/2007^(2) + 1/2008^(2)) equal to?

Find the value of (1-1/(2^(2)))(1-1/(3^(2)))(1-1/(4^(2)))(1-1/(5^(2)))…….(1-1/(9^(2)))(1-1/(10^(2)))