$3sin^3\left(x\right)csc\left(x\right)+cos^2\left(x\right)+2cos\left(-x\right)cos\left(x\right)$
$2+\frac{1}{2}x\le-x+5$
$\int x ^ { 2 } \sqrt { x ^ { 3 } + a ^ { 3 } d x }$
$-8+12-25+2$
$x^2+8x+16\ge254$
$15sin^2x=17-7cosx$
$2x^2-x-21=0$
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