Prove that the two formulae (1) \( \left(2 n+\frac{1}{2}\right) \pi \pm \alpha \) and (2) \( n \...
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0Prove that the two formulae
(1) \( \left(2 n+\frac{1}{2}\right) \pi \pm \alpha \) and (2) \( n \pi+(-1)^{n}\left(\frac{\pi}{2}-\alpha\right) \) denote the same angles, \( n \) being any integer.
Illustrate by a figure.
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