$2\left(4^2\right)+-2^3+-5^3+-3^5$
$x^2+2x>15$
$4x^4-5x^2x+4$
$4x^2+4x+2=0$
$687\cdot7$
$\frac{18x^2-9x-8x^4+2}{4x^2+1}$
$\cos x\cdot\sec x-\frac{\cos x}{\sec x}=\sin^2x$
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