Explore BrainMass

# evaluate trigonometric expression

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

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

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

https://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