`f(t) = 3(sec(pit-1))^2`
`or, f(t) = 3sec^2(pit-1)`
`thus, f'(t) = 6sec(pit-1)*[sec(pit-1)*tan(pit-1)]*pi`
`or, f'(t) = 6pi*sec^2(pit-1)*tan(pit-1)`
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