$\frac{\sec\left(x\right)-\cos\left(x\right)}{\sec\left(x\right)}=sin^2x$
$-10\left(-2a+10\right)^2$
$-145+-211+-320$
$4x^4-2x^2$
$\lim_{x\to\frac{\pi}{8}}\left(sin^2x-cos^2x\right)$
$5.5\left(23\:-\:3.66x\right)$
$2\left(3\right)+\left(8-12\right)-4\left(1\right)$
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