Integral of sec(x) using Weierstrass Substitution

In this video, we look at the integral of sec(x) using the Weierstrass substitution derived from the previous video on the Weierstrass substation. We use:
dx = 2/(1+t^2) dt
sin(x) = (2t)/(1+t^2)
cos(x) = (1-t^2)/(1+t^2)
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