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19 December, 10:08
Sec^2x+2sec=0. solve the equation for 0
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Danielle Cross
19 December, 10:17
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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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