35/cos в квдрате 84градуса +cos в квадрате174 градуса
35/(cos^2(84) + cos^2(174)) = 35/(cos^2(84) + cos^2(90+84))=35/(cos^2(84) + sin^2(84))=35/1=35
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35/(cos^2(84) + cos^2(174)) = 35/(cos^2(84) + cos^2(90+84))=35/(cos^2(84) + sin^2(84))=35/1=35