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Homework Statement Integral [sec(x^2)/ 81 + tan (x^2)] Homework Equations sinx^2 + cos x^2=1 sec= 1/cos The Attempt at a Solution integral[ 1/81cos (x^2) + 81(sin(x^2)/cos(x^2))] = 1/81 integral [1/ 1/cos(x^2)]= 1/8 integral[cos(x^2)] = 1/8 sin(x^2) This was my answer. But...

I am not sure how would I work this problem. Any help would be appreciated. Estimate ln 1. 5 = Integral from 1 to 1.5 dt/t using the approximation 1 2 [Lf (P) + Uf (P)] with P = {1 =8/8, 9/8, 10/8, 11/8, 12/8=1.5}