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Mathematics 11 Online
NvidiaIntely (nvidiaintely):

@kevin

NvidiaIntely (nvidiaintely):

OpenStudy (kevin):

cos a = (b^2 + c^2 - a^2) /(2*b*c) cos a = (28^2 + 15^2 - 34^2)/(2*28*15) cos a = -0.175 a = 100 degree

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