$\cos105=\frac{1}{\sec105}$
$\left(\frac{3x+5}{x}\right)^{2x}$
$\int1.7e^{.02x}dx$
$2m-3n-x-x-y$
$0.2x-0.1>0.3$
$y=ln\left(2x^2+4x\right)$
$\left(m^4+2m^2n^2+4n^2\right)\left(m^4-2m^2n^2+4n^2\right)$
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