3.Find the sum: (a)
`2frac(1)(2)+5frac(3)(4)`

Find the sum: 4(3)/(5)+2(7)/(8)

Find the sum (1^4)/(1xx3)+(2^4)/(3xx5)+(3^4)/(5xx7)+......+(n^4)/((2n-1)(2n+1))

Find the sum (1^2)/2-(3^2)/(2^2)+(5^2)/(2^3)-(7^2)/(2^4)+....oodot

Find the sum 3(1)/(5)+4(3)/(5)+7(2)/(5)

If tan^-1 x=y then : (a) -1lt y lt 1 (b) frac(-pi)(2)le y le frac(pi)(2) (c) frac(-pi)(2)lt y lt frac(pi)(2) (d) y in {frac(-pi)(2),frac(pi)(2)}

Find the sum (1^2)/(2)+(3^2)/(2^2)+(5^2)/(2^3)+(7^2)/(2^4)+….oo

Find the sum:  (i) 5/8+3/(10) (ii) 4 3/4+9 2/5

Find the sum:  (i) 5/6+3+3/4 (ii) 2 3/5+4 7/(10)+2 4/(15)

If f(x)=x^3-frac{1}{x^(3)} find the value of f(x)+f(frac{1}{x})

Evaluate: tan^(-1)(tan frac(6pi)(7))