$\frac{12}{13}\frac{\pi}{2}<a$
$\left(-9a^2b^3c^2+3abc^3-6a^3b^3c\right)$
$\sqrt{88^2+66^2}$
$5a^2+5ab+5^2$
$2x^2+4x+10=0$
$0.45\cdot2.033$
$-9\left[-12+\left(4-3\right)-6\right]-7+3-\left(8-5\right)$
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