--description--

In this video, you will learn how to find the sine and cosine of special angles, such as 30°, 45°, and 60°.

--questions--

--text--

What is the cosine of 45° for a right triangle with the hypotenuse of length 5?

--answers--

$\frac{\sqrt{3}}{2}$

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$\frac{\sqrt{5}}{5}$

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$\frac{1}{\sqrt{2}}$

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$\frac{\sqrt{2}}{2}$

--video-solution--

4