$\ln\left(x^2\right)=\ln\left(x+1\right)$
$\int_0^{\infty}\:13e^{-13x}\:dx$
$f\left(x\right)=81^{3x-1}$
$t^{2}\frac{dy}{dt}-ty=0$
$x+5=x+3$
$\cos0\left(1-\cos^20=\sin0\right)$
$\sqrt[4]{1+\left(x^4-1\right)\left(x^4+1\right)}$
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