$\cos\left(\frac{\pi}{4}-x\right)-sin\left(\frac{\pi}{4}+x\right)$
$\sqrt{50}-\sqrt{\frac{18}{4}}+\sqrt{\frac{72}{25}}$
$3x-4+6x+2$
$\frac{x-5}{3}\le-2$
$1224\cdot259$
$\left(15x^2-4y\right)\left(15x^2+4y\right)$
$a+b+3^2$
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