$-20:-\left(-1\right)+2$
$9a\:-\:5b\:+\:a\:+3b\:-7a$
$x^2+18x+49$
$8sinx\:+20=24$
$\frac{-18x^6}{6x^3}$
$sinx\left(cos^2x-cos^4x\right)=sin^3x-sin^5x$
$f\left(x\right)=\sqrt{4}\sin^2x+\sqrt{9}\cos^2x$
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