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Find the values of the other five trigonometric functions if $\tan x = -\frac{5}{12}$ and $x$ lies in the second quadrant.

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$\cos 18^{\circ} = $

The expression $\frac{\tan(x - \frac{\pi}{2}) \cdot \cos(\frac{3\pi}{2} + x) - \sin^3(\frac{7\pi}{2} - x)}{\cos(x - \frac{\pi}{2}) \cdot \tan(\frac{3\pi}{2} + x)}$ simplifies to:

Find the angle in radians through which a pendulum swings if its length is $75 \, cm$ and the tip describes an arc of length $21 \, cm$.

What are the polar coordinates of $(-\sqrt{3}, -1)$?

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