$\lim_{x\to-0.01}\frac{\sin\left(x\right)}{1+\tan\left(x\right)}$
$3\left(-4\right)^2-4\left(-4\right)+7$
$5x^2-30x-35$
$\frac{db}{dt}+4b=40$
$\sin\left(x\right)^2+\cos\left(-\frac{5}{13}\right)^2=1$
$2x+8x-8y=32$
$\ln\left(x^2\right)-6\ln\left(\sqrt[6]{x}\right)$
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