$ycotx-xycotx$
$4x+v-2x-x-v$
$\frac{x^4-x^3+x^2-5}{x^2+1}$
$2x^4-10x+8$
$12\sin\left(x\right)+6=0$
$2sin^2x=1-sinx$
$.5\cdot\frac{1}{2}$
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