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How to solve these equations? <img src="-f--3Cbr-20-2F-3E-201)-20sin-5E2x-2B-7Csinx-7C-2-3D0-3Cbr-20-2F-3E.jpg"> <img src="-f--3Cbr-20-2F-3E-202)-20-7Csinx-7C-20-3D-20cos2x.jpg">
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Feb 9, 2016
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How to solve these equations?
Mathematics
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Mcloving
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1) / sin x / = y ≥ 0 ;
We solve the equation
a = 1 ; b = 1 ; c = - 2 ;
y1 = ( - 1 + 3 ) / 2 = 1 ≥ 0 ( correct ) ;
y2 = ( - 1 - 3 ) / 2 = - 2 ≥ 0 ( false ) ;
Then, / sin x / = 1 ;
sinx = + 1 or sin x = - 1 ;
x ∈ { 90 } U { 270 } ;
x ∈ {90 , 270}.
Sahu
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Feb 15, 2016
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Sahu
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