$\int_0^{\frac{4}{5}}x^2\sqrt{16-25x^2}dx$
$a^x-a^{x+1}+a^{x+2}\cdot a+1$
$\left(\frac{2}{5}b^2-5c\right)\left(\frac{2}{5}b^2+5c\right)$
$8-2\cdot\left(5-22\right)$
$x^{4}-2x^{3}-8x+16$
$\frac{-60m^3n}{5m^5n^{-2}}$
$cotx-tanx=\frac{2cos2x}{sin2x}$
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