Предмет: Математика, автор: adjaragudju1

1 номер кто может помочь или 8 пж!!

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Автор ответа: вкпа

$sinalpha =-frac{15}{17}, alpha in (frac{3pi}{2};2pi);\sin^2alpha +cos^2alpha=1;\cosalpha=sqrt{1-sin^2alpha}=sqrt{1-(-frac{15}{17})^2}=sqrt{1-frac{225}{289}}=sqrt{frac{64}{289}}=frac{8}{17}.$

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