Knowledge Base

Solution 12278: Calculating Secant, Cosecant, and Cotangent Trigonometric Functions on the TI-30X IIS/B.

How do I calculate secant, cosecant, and cotangent trigonometric functions on the TI-30X IIS/B?

TI scientific calculators do not feature the secant, cosecant, or cotangent trigonometric functions as separate keys. The properties of trigonometric functions must be used to calculate measurements using the below inverse trig functions:

csc(x) = 1/sin(x)
sec(x) = 1/cos(x)
cot(x) = 1/tan(x)

The example below will demonstrate the use of these properties on the TI-30X IIS/B.

Example: Solve for the Cosecant of 31.67 degrees.

Please Note: Be sure the calculator is set to Degree mode before beginning. Press the [DRG] key, move the cursor under 'DEG', and press [=].

1) Press [SIN] and enter 31.67.
2) Press [ ) ] [x^-1] [=] to solve.

This will return 1.904667232... as the cosecant of 31.67 degrees.