Shakawaldgi Shakawaldgi

02-09-2016
Mathematics

contestada

sec^2x+2sec=0. solve the equation for 0

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HomertheGenius HomertheGenius

10-09-2016

u = sec x ( substitution )
u² + 2 u = 0
u ( u + 2 ) = 0
u = 0, or u = - 2
1/cos x = 0 1/cos x = - 2
(not accepted ) cos x = -1/2
x 1 = 2π/3, x 2 = 4π/3

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