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Anonymous
x^2 + x = 0
x(x+1) = 0
x = 0 and x = -1
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One plus cosecant squared x is equal to cotangent squared x.
x2 + x2 = 2x2 2x^2
It is x = 0.
4x2 + 1 + x2 + 3 = 5x2 + 4
if it is not this . -3<x<-2 < or equal