Explain why:

MATHEMATICS · Multi-part · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Explain why: (1) cos⁡400∘=cos⁡40∘\cos400^\circ=\cos40^\circ (2) sin⁡5π7=sin⁡19π7\sin\frac{5\pi}{7}=\sin\frac{19\pi}{7} (3) tan⁡13π8=tan⁡(−11π8)\tan\frac{13\pi}{8}=\tan\left(-\frac{11\pi}{8}\right)

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