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Chapter 5

Q. 5.2.6

Evaluating sine and cosine with a calculator

Find each function value rounded to four decimal places.

.a. sin(4.27)                b. cos(-39.46°)

Step-by-Step

Verified Solution

a. With the calculator in radian mode, we get \sin (4.27) \approx-0.9037

b. With the calculator in degree mode, we get \cos \left(-39.46^{\circ}\right) \approx 0.7721

  • If you use the symbol for radians or degrees, as shown in Fig. 5.32, then it is not necessary to change the mode with a graphing calculator.
Evaluating sine and cosine with a calculator Find each function value rounded to four decimal places. a. sin(4.27) b. cos(-39.46°)