$\frac{4+25x^2}{2\sqrt{4+25x^2}}$
$-2\cdot126\cdot0$
$\int_1^1x.ln\left(x\right)dx$
$csc\left(x\right)=-2$
$\left(\frac{3}{7}x^2-15\right)\left(\frac{3}{7}x^2+8\right)$
$\int\left(tan\:3x+sec\:3x\right)dx$
$x+3x+5$
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