$3x+y+2y+5x+3$
$11.42-87.23$
$\:\left(tan\:x\:+\:ctg\:x\right)\:tan\:x\:=\:sec2\:x$
$\ln\left(2x+7\right)=\ln\left(3\right)-\ln\left(x-1\right)$
$\int\sqrt{4x^2+81}dx$
$\lim_{x\to-5}\left(\frac{x^3-3x+110}{t^2-t-30}\right)$
$\frac{1-tan^2x}{1+tan^2x}=2cosx-1$
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