[" 84."],[qquad sum_(0=0)^(oo)(1)/(1+tan^(3)(10 theta)^(@))" ejual "]

sum_(0)^(oo)(1)/((3n+1)(3n+2))

The value of the expression sum_(theta=0)^(8)(1)/(1+tan^(3)(10 theta)^(@)) equals

sum_(n=0)^( oo) (-1)^(n) x^( n+1)=

sum_ (0) ^ (oo) ((1) / (3)) ^ (x) =?

sum_(r=0)^(oo)((r+1)((2)/(3))^(r)) is

The value of the expression sum_(theta =0)^8 1/(1 + tan^3 (10theta)^@) equals

The value of the expression sum_(theta =0)^8 1/(1 + tan^3 (10theta)^@) equals

sum_ (n = 0) ^ (oo) (- 1) ^ (n) x ^ (n + 1) =

If theta in (pi//4, pi//2) and sum_(n=1)^(oo)(1)/(tan^(n)theta)=sin theta + cos theta , then the value of tan theta is

If theta in (pi//4, pi//2) and sum_(n=1)^(oo)(1)/(tan^(n)theta)=sin theta + cos theta , then the value of tan theta is