# evaluate trigonometric expression

Not what you're looking for? Search our solutions OR ask your own Custom question.

How do I evaluate the following trigonometric expression involving special angles?

1. sin60Â° cos30Â° - cos45Â° sin45Â°

2. tan60Â° - tan45Â° / 1 + tan60Â° tan45Â°

3. [1 + cotÂ² 30Â°]Â³

Please explain.

Â© BrainMass Inc. brainmass.com December 24, 2021, 7:26 pm ad1c9bdddfhttps://brainmass.com/math/trigonometry/evaluate-trigonometric-expression-190084

## SOLUTION This solution is **FREE** courtesy of BrainMass!

Please see the attached file for details.

trigonometric expression involving special angles

How to evaluate the following trigonometric expression involving special angles?

The values of the trigonometric function of these special angles are well known. So we just need to substitute the values to the expression and evaluate it.

For example:

Then we can find the tan and cot values of these angles.

1. sin60Â° cos30Â° - cos45Â° sin45Â° =

2. tan60Â° - tan45Â° / 1 + tan60Â° tan45Â°

3. [1 + cotÂ² 30Â°]Â³

please explain.

Â© BrainMass Inc. brainmass.com December 24, 2021, 7:26 pm ad1c9bdddf>https://brainmass.com/math/trigonometry/evaluate-trigonometric-expression-190084