$25\left(y-7\right)^2$
$\cos^220-\sin^220$
$\frac{d^2}{dx^2}\left(x+5\right)$
$\lim_{x\to0}\left(\frac{x\cdot7^x}{7^x-1}\right)$
$20+90+51\left|5\right|$
$1-sin^2-sin^2x\infty$
$\:4x^2-\left(3x-5\right)^2$
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