Find the Value Using the Unit Circle cos((5pi)/2)

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Trigonometry

$\cos (\frac{5 π}{2})$

Find the value using the definition of cosine.

$\cos (\frac{5 π}{2}) = \frac{adjacent}{hypotenuse}$

Substitute the values into the definition.

$\cos (\frac{5 π}{2}) = \frac{0}{1}$

Divide $0$ by $1$ .

$0$

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