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Quadrantal angles

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Evaluate the expressions involving quadrantal angles:

1. sin270°cos180° + sin180°cos360° =

2. tan²180° + 2sec²540° - csc810° =

3. 4tan² 5π/2 - sec²6π =?

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The solution provides examples of working with quadrantal angles.

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1. sin270°cos180° + sin180°cos360° = ...

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