$\left(-30\right)-\left(-40\right)$
$\frac{2}{\sqrt{7+x}}$
$\cos\left(u\right)\sec\left(u\right)-\sin^2\left(u\right)=\cos\left(u\right)$
$12+\frac{2}{-2}$
$\sin^245^{\circ\:}-\cos\:^245^{\circ\:}$
$+360:-12:-11$
$8^{10}x\:8^4$
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