$f=\csc x-\csc x\cdot\cos^2x$
$0.8a^2+9a-1.3a^2-4a$
$10-\left(-5\right)+9$
$\left(\frac{2a^7b^{-4}}{8a^9b^{-2}}\right)^{-3}\cdot\left(-6a^{-1}b^0\right)^{-2}$
$\lim_{x\to2}\left(\frac{x^3-x^2-6x+12}{x^2+3x-10}\right)$
$\frac{1+0.02}{-4}$
$7a+5b-3a+2b$
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