Question

question 9
use a graphing calculator to evaluate. round to 3 decimal places.
cos (126°) =
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question 10
use a calculator to evaluate. round to 3 decimal places.
sin (40°) =
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Explanation:

Question 9

Step1: Set calculator to degree mode

Since the angle is in degrees, ensure the calculator is in degree mode.

Step2: Calculate \(\cos(126^{\circ})\)

Using a graphing calculator, input \(\cos(126)\). The value is approximately \(- 0.5877852523\).

Step3: Round to 3 decimal places

Rounding \(-0.5877852523\) to three decimal places gives \(-0.588\).

Question 10

Step1: Set calculator to degree mode

Since the angle is in degrees, ensure the calculator is in degree mode.

Step2: Calculate \(\sin(40^{\circ})\)

Using a calculator, input \(\sin(40)\). The value is approximately \(0.6427876097\).

Step3: Round to 3 decimal places

Rounding \(0.6427876097\) to three decimal places gives \(0.643\).

Answer:

Question 9: \(-0.588\)
Question 10: \(0.643\)