Recent content by cj5892

  1. C

    What is the Derivative of the Infinite Series of Tangent Powers?

    i still can't get it :(
  2. C

    What is the Derivative of the Infinite Series of Tangent Powers?

    Homework Statement Consider the infinite series s(x)=1-tan^2(x)+tan^4(x)-tan^6(x)+... , where 0<x<pi/4 s'(x)= A.sin2x B.cos2x C.-tan2x D.-sin2x E.-cos2x The Attempt at a Solution Attempting to derive the series, i get 1-2tanxsec^2x+4tan^3(x)sec^2(x)-6tan^5(x)sec^2(x)+... am i...