26. Calcule. a) sen 135° b) cos 75° c) tg $\frac{2\pi}{3}$ d...

Calcule. a) sen 135° b) cos 75° c) tg $\frac{2\pi}{3}$ d) sen $\frac{5\pi}{6}$

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$26. Calcule. a) sen 135° b) cos 75° c) tg $\frac{2\pi}{3}$ d) sen $\frac{5\pi}{6}$$

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