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NvidiaIntely (nvidiaintely):
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NvidiaIntely (nvidiaintely):
OpenStudy (kevin):
cos a = (b^2 + c^2 - a^2) /(2*b*c) cos 62 = (15^2 + 21^2 - a^2) /(2*15*21) 0.47 = (15^2 + 21^2 - a^2) /(2*15*21) a = 19.23
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