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OpenStudy (anonymous):
How do I evaluate arcsec(-2) by hand??
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OpenStudy (anonymous):
arcsec(-2) = arccos(-1/2) = 120 as cos(120) =-1/2
OpenStudy (anonymous):
why -1/2?
OpenStudy (anonymous):
actually, nvm, I think I see why now.
OpenStudy (anonymous):
Thank you very much:)
OpenStudy (anonymous):
yw
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