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5-9.

Evaluate each of the following trigonometric expressions without a calculator. Homework Help ✎

1. $\sin\left(\frac{5\pi}{3}\right)$

1. $\cos\left(-\frac{\pi}{4}\right)$

1. tan$\left(\frac{\pi}{2}\right)$

What is the slope of the line associated with an angle of $\frac{\pi}{2}$?