$4x^2+4$
$\left(4-25\right)-\left(16-24\right)-\left(21-36\right)$
$\cos45\cos30+\sin45\sin30$
$\frac{7}{\frac{1}{6}}$
$-10+1-9x+6-8xz+x$
$5+8\left(3+6\right)$
$\frac{c}{7}+2=17$
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