KayRa4Smayna KayRa4Smayna

26-11-2016
Mathematics

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Solve "cos 3x = -1" algebraically given the domain [0,2pi)

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HomertheGenius HomertheGenius

02-12-2016

cos 3 x = - 1, given the domain [ 0, 2 π ].
3 x = π, x 1 = π / 3 ( or : x 1 = 60° )
3 x = 3 π, x 2 = π ( x 2 = 180° )
3 x = 5 π, x 3 = 5 π / 3 ( x 3 = 300° ).

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