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evaluate trigonometric expression

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

1. sin60° cos30° - cos45° sin45°

2. tan60° - tan45° / 1 + tan60° tan45°

3. [1 + cot² 30°]³

Please explain.

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trigonometric expression involving special angles
How to evaluate the following ...

Solution Summary

The solution shows how to evaluate trigonometric expression at some special angles such as 30, 45, and 60 degrees.

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