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12-11-2016
Mathematics

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Cos theta -2sin theta cos theta =0

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mreijepatmat mreijepatmat

28-05-2017

cos(Ф) - 2sin(Ф).cos(Ф) =0

Factorize--> cos(Ф)[ 1-2sin(Ф)] =0

a) cos(Ф) = 0 ==> Ф= 0 or (0+2kπ)

b) 1-2sin(Ф) =0 ==> -2sin(Ф) = - 1 ==> sin(Ф) =1/2 Or

sin(Ф) = 1/2 ==> Ф =π/3 OR π/3 + (k+1)π/3

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