$4\cdot\left(3.15-1.55\right)\cdot10$
$\sqrt{2475n^5y^4}$
$3x-4y-4x+2x+5-y$
$\frac{1}{2cos2}$
$\frac{4x^3-40x^2-5x+25}{x+3}$
$\int8senxcos^4-6senxcos^2xdx$
$t^2-18t+81$
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