$sin\left(x+\frac{5\pi\:}{2}\right)-3cos\left(-\frac{\pi\:}{2}\right)-4sin\left(9\pi\:-x\right)$
$logx=8$
$y\sqrt{x+1}=4$
$\lim_{x\to-1}\left(\frac{\left(3x^4+7x^3+8x+12\right)}{x+1}\right)$
$\left(25x^4y^{\frac{4}{3}}\right)^{\frac{3}{2}}$
$ydy-7xdx=0$
$\lim_{x\to0}\left(\frac{5x^2-3x+2}{1-3x^2}\right)$
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