$\frac{d}{dx}20$
$\cos\left(60+x\right)=\sin\left(30-x\right)$
$30k+70=20k+80$
$\frac{sin\left(\frac{\pi}{3}\right)}{cos\left(\frac{\pi}{4}\right)}$
$\left(-8\right)\left(7\right)$
$\sin\left(x\right)-\sin\left(x\right)x\:\cos^2x$
$-4x<60$
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