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OpenStudy (tomektomeknyc):
sec (90 degrees - Arc Sin 1/2) = a) 1/2 b) 2 c)2 /√3 d)- 2
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OpenStudy (anonymous):
\[\sec(\pi/2-\pi/6)=\sec(\pi/3)=1/\cos(\pi/3)=2\]
OpenStudy (tomektomeknyc):
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