1. Find the sum of the geometric series 1-t^2+t^4-t^6+...+t^(4n) and hence show that for 0<T<X,< b>
1/(1+t^2) < 1-t^2+t^4-t^6+...+t^(4n)
2. Find 1-t^2 + t^4 - t^6 + ...+ t^(4n) - t^(4n+2) and hnce show that for 0 < t < x
1-t^2+t^4-t^6 + ...+ t^(4n) < 1/(1+t^2) + t^(4n+2)
Help me with these...