Question: In Example 5, change 8/15(180 < < 270) to 8/15(270 < < 360). Data from Example 5 Given that tan =

In Example 5, change 8/15(180°


Data from Example 5

Given that tan α = 8/15 (180°

Knowing that tan α = 8/15 for a third-quadrant angle, we determine from Fig. 20.20 that cos α= −15/17. This means

cos2 = = 1 + (-15/17) 2 17 = 17 = -0.2425


Because 180°

2 34 using Eq. (20.27)

cos2 = = 1 + (-15/17) 2 17 = 17 = -0.2425 2 34 using Eq. (20.27)

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