$5\:+\:2x\:+\:y\:+\:2x\:-\:1\:$
$\int\left(e^{7x-1}\right)dx$
$25a^2+90at+81t^2$
$\frac{1}{8}\cdot\:\left(3+4\cdot\:\:cos2x+cos4x\right)=cos^4x$
$3+a+b+a+a$
$6.674\:-0,01$
$\frac{1}{2}\left(x^2+lnx-1\right)$
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