Trigonometry Test Topics

As the Trigonometry Diagnostic Test showed you, you have a lot of definitions and identities to
remember: the sine, cosine, and tangent of acute angles measured in degrees; cotangent, secant,
and cosecant; angles greater than 90° and angles measured in radians; graphing trigonometric
functions; arcsin, arccos, and arctan; half-angle and double-angle identities; and the laws of sines
and cosines. We’ll use the questions on the diagnostic to review these trigonometry topics.

RIGHT TRIANGLES AND SOHCAHTOA

To remember the definitions of sine, cosine, and tangent as they apply to right triangles, use the
mnemonic SOHCAHTOA. That and a calculator are all you need to answer Example 1.

SOHCAHTOA

Example 1

Figure  1