(1/4)x^2(2logx-1) + c
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d/dx ( log x) = 1/x
-logx=21.1 logx=-21.1 e^-21.1=x
∫ tan(x) dx = -ln(cos(x)) + C C is the constant of integration.
∫ cosh(x) dx = sinh(x) + C C is the constant of integration.
logx = 2 so x = 10logx = 102 = 100 ie x = 100.