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## 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°)

## 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.