$\lim_{x\to-5}\left(\frac{x^2+11x+30}{-40-30x+x^2}\right)$
$0.25k-k$
$\frac{\left(1+\sin\left(x\right)-\cos\left(x\right)\right)}{sinx}$
$-6.2-10.6$
$\int\left(5x^3-10x^2\right)^4\left(3x^2-4x\right)dx$
$\int\frac{2x-26}{x^2+x-20}dx$
$\frac{d}{dx}x^2+y^2-4xy=0$
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