Find the Exact Value cos(-60 degrees )

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Trigonometry

$\cos (- 60 °)$

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

$\cos (60)$

The exact value of $\cos (60)$ 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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