$7\cos b+9=3\cos b+8$
$8x^2+3\left(x^2+y\right)$
$\frac{a^{5}b^{3}c^{4}e}{a^{2}b^{7}c^{4}d}$
$\sin\left(x\right)+\:\cos\left(y\right)=2x$
$sin\left(23.1x\right)+\frac{1}{csc\left(\left(2.5x\right)\right)}$
$cos\:=-\frac{4}{5}$
$( + 6 ) \in ( - 3 )$
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