(4-y^2)^1/2

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Solution for (4-y^2)^1/2 equation: 


y in (-oo:+oo)

((4-y^2)^1)/2 = 0

(4-y^2)/2 = 0

-1*y^2 = -4 // : -1

y^2 = 4

y^2 = 4 // ^ 1/2

abs(y) = 2

y = 2 or y = -2

y in { 2, -2 }

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