Education Technology

# Knowledge Base

## Solution 34771: Calculating Sine, Cosine, and Tangent Using the TI-84 Plus C Silver Edition Graphing Calculator.

### How do I calculate sine, cosine, and tangent using the TI-84 Plus C Silver Edition?

The following examples will demonstrate how to compute sine, cosine, and tangent using the TI-84 Plus C Silver Edition.

Please Note: For these examples, the calculator's angle setting will need to be changed.

1) Press [MODE] key.
2) Scroll down to "RADIAN", scroll right to highlight "DEGREE" and press [ENTER]. This will change the calculator's angle setting to Degree mode.

For Example: Calculate the sine of 30°.

1) Press [SIN] [3] [0].
2) Press [)] [ENTER].

For Example: Calculate the cosine of 60°.

1) Press [COS] [6] [0].
2) Press [)] [ENTER].

For Example: Calculate the tangent of 26.57°.

1) Press [TAN] [2] [6] [.] [5] [7].
2) Press [)] [ENTER].

Please Note: Since the calculator's angle setting is set to Degree, there's no need to input the degree symbol ( ° ) behind the value.

Please see the TI-84 Plus C Silver Edition guidebook for additional information.