$23=\sin^{-1}\left(\frac{x}{8}\right)$
$\left(y-x\right)dx+\left(y+x\right)=0$
$-4a+3a+2a$
$cos\frac{\pi}{8}$
$25^x+5^{x+1}=750$
$\sqrt{\left(-asenteta\right)^2+\left(-a\right)^2+\left(-acosteta\right)^2}$
$2\cos^2\left(x\right)-5=-9\cos^2\left(x\right)$
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