December 2021 0 21 Report
В треугольнике ABC угол C=90 градусов. cosA= (2*корень из 29)/29. Найдите tg <B я знаю как начать:
cosA=sinB=2корень из 29/29
дальше по формуле
sin^2B+cos^2B=1
cos^2B=
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