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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
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    Solution Summary

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