`g(t) = t^4 + t^3 + t^2 + 1`
`or, g'(t) = 4t^3 + 3t^2 + 2t`
`or, g'(t) = t(4t^2 + 3t + 2)`
` g'(t) = 0`
`(4t^2 + 3t + 2)t = 0`
Hence the critical number is t = 0
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