Report copyright - ~r - s3.amazonaws.com fileSolutions Manual 21. cos 0 - cos 0 tan 0 = 0 (60) cos 0(1 - tan 0) = 0 COS 0 = 0 o = 90°,270° I-tanO=O tan 0 = 1 o = 45°,225° Since tan 90° and tan 270°
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