4.2 Trigonometric Ratios and Special Angles

*Remember*

Examples of special triangles :
(a)                                                                                     (b)

The table below is able to help you more understand about the special triangles :

♥ In this chapter, to calculate trigonometric ratios for an angle expressed in radian measure by setting the angle mode to radian in the calculator.
♥ Use the unit circle and special triangles to determine the exact values for trigonometric ratios of special angles 0,π/6, π/4, π/3, and π/2.
♥ Use the CAST rule to determine the exact values for the trigonometric ratios of multiples of the special angles.



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