Finding Trigonometric Function Values using a CalculatorObjective:

Evaluate trigonometric functions using a calculator

Evaluating trigonometric functionWhen evaluating a trigonometric

function with a calculator, you need to set the calculator to the desired mode of measurement (degree or radian). Most calculators do not have keys for cosecant, secant, and cotangent functions. To evaluate these functions, you can use the reciprocal key with their respective reciprocal functions: sine, cosine and tangent. Round the answers to four decimal places.

EX: Use a calculator to evaluate the trigonometric function.

Degrees Radians

1.

2.

3.

4.

5.

6.

cos115.34

csc97 34

tan 250 15

sin0.5149

cot1.3209

sec 2.9234

Evaluating trigonometric function When you are finding the angle

measure for the given trigonometric value, you use the inverse function keys on your calculator and give the entire decimal answer for the angle in degree or radian mode.

EX: Use a calculator to find a value of the angle in the first quadrant

satisfying each of the following.

Degrees

7.

8.

9.

10.

11.

12.

sin 0.81815000

tan 6.4358841

sec 1.0545829

cos 0.96854556

Radians

cot 0.29949853

csc 1.03089436