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# Pythagorean identities

These Pythagorean identities are very useful whenever expressions involving trigonometric functions need to be simplified.

$$\sin ^2 \alpha +\cos ^2 \alpha = 1$$ $$1+\tan^{2}\alpha=\sec^2\alpha$$ $$1+\cot^{2}\alpha=\csc^2\alpha$$

2020-11-28