Question

indique o valor do cosseno da seguinte medida cos 11π /2​

Answer 1

Boa Noite !!!

$\cfrac{11\pi }{2} \\\\\\\cfrac{11 . 180}{2} \\\\\\\cfrac{1980}{2} \\\\\\\cfrac{11\pi }{2} = 990^o, sabendo\ disso :\\\\\\\cfrac{990^o}{360^o} = 270^o, diminuindo\ ao\ primeiro\ quadrante :\\\\\\360^o - 270^o = 30^o,\ para\ o\ cosseno\ equivale :\\\\\\cos = \cfrac{\sqrt{3} }{2}$

Espero ter ajudado :-)

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