Education Technology

# Knowledge Base

## Solution 11924: Calculating Inverse Sine (Arcsine), Cosine (Arccosine), and Tangent (Arctangent) Using the TI-83 Family, TI-84 Plus Family, and TI-Nspire™ Handheld in TI-84 Plus Mode.

### How do I calculate inverse sine (arcsine), cosine (arccosine), and tangent (arctangent) using the TI-83 family, TI-84 Plus family, and TI-Nspire handheld in TI-84 Plus mode?

To calculate inverse sine (arcsine), cosine (arccosine), and tangent (arctangent) using the TI-83 family, TI-84 Plus family, and TI-Nspire handheld in TI-84 Plus mode, follow the steps below.

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

1) Press the [MODE] key.
2) Scroll down to "RADIAN", scroll right to highight "DEGREE" and press [ENTER].

Example: Calculate the inverse sine (arcsine) of .5.

1) Press [2nd] [SIN], input .5, then press [ ) ] [ENTER].

Example: Calculate the inverse cosine (arccosine) of .5.

1) Press [2nd] [COS], input .5, then press [ ) ] [ENTER].

Example: Calculate the inverse tangent (arctangent) of .5.

1) Press [2nd] [SIN], input .5, then press [ ) ] [ENTER].

Please Note: The screenshots above were created using the TI-84 Plus family Operating System v 2.55MP.

Please see the TI-83 family and TI-84 Plus family guidebooks for additional information.

Please Note: TI-Nspire handheld in TI-84 Plus mode users may refer to the TI-84 Plus family guidebook.