$1-\tan^2b=2-\sec^2b$
$\int_0^{2\pi}e^x\cos\left(x\right)dx$
$-598-483$
$16x\:6\:y\:8\:-\:8\:x\:3\:y\:4\:z\:7\:+\:z\:14$
$x^2+6x+9=16$
$\left(-5\right)\left(-7\right)\left(-20\right)$
$\lim_{x\to\left(0\right)}\left(\frac{e^{8x}}{sin\left(x\right)}\right)$
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