$x^2+30>11$
$\sin\left(nx\right)+\sin\left(nx+2x\right)+\sin\left(nx+4x\right)$
$\left(10x+8\right)\:\left(10x-8\right)$
$\frac{4}{9}a^2-\frac{4}{5}ab+\frac{9}{25}b^2$
$\left(2x^2-5xy-8y^2\right)de\left(-4x^2-5y^2-xy\right)$
$\frac{\cot\left(x\right)}{\sec\left(x\right)}+\frac{-\cos^2\left(x\right)}{1+\sin\left(x\right)}$
$2a^2+a=1$
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