$-19+\left(-18\right)-\left(-25\right)$
$1-2i^2$
$4x^55+2x-1$
$4x\:+\:4=5x+3$
$\frac{\sin^4\left(x\right)}{\left(1-\cos^2\left(x\right)\right)}$
$a+7+3b+3a-2b$
$\left(-4uv^3\right)\:\left(3u^3v^4\right)$
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