Trigonometric Ratios

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The value of cos 60° is

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1. **Complementary Property**: We know that $\cos 	heta = \sin(90^{\circ} - 	heta)$.
2. **Calculation**: $\cos 60^{\circ} = \sin(90^{\circ} - 60^{\circ}) = \sin 30^{\circ}$.
3. **Result**: Since $\sin 30^{\circ} = 1/2$, the value of **$\cos 60^{\circ} = 1/2$**.

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