Zadanie 1 Obliczyć (a) sin pi/8 , (b) cos pi/12 (c ) tg pi/8 d) tg 2/3pi (e) sin 5/6pi (g) sin 7/4pi (h) cos 7/6pi
sin\frac{7}{4}\pi=sin(2\pi-\frac{\pi}{4})=-sin\frac{\pi}{4}=-\frac{\sqrt2}{2}
sin\frac{5}{6}\pi=sin(\pi-\frac{\pi}{6})=sin\frac{\pi}{6}=\frac{1}{2}
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cos\frac{4}{3}\pi=cos(\pi+\frac{\pi}{3})=-cos\frac{\pi}{3}=-\frac{1}{2}
tg\frac{2\pi}{3}=tg( \pi -\frac{\pi}{3})=-tg\frac{\pi}{3}=-\sqrt3
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