Find the Exact Value cos(-pi/3)

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Trigonometry

$\cos (- \frac{π}{3})$

Add full rotations of $2 π$ until the angle is between $0$ and $2 π$ .

$\cos (\frac{5 π}{3})$

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

$\cos (\frac{π}{3})$

The exact value of $\cos (\frac{π}{3})$ is $\frac{1}{2}$ .

$\frac{1}{2}$

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{2}$

Decimal Form:

$0.5$

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