what is the derivative, i have an answer not sure though
4 * cos³ (1 - 2t) * - sin (1 - 2t) * -2
= 8 * cos³ (1 - 2t) * sin (1 - 2t)
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4 * cos³ (1 - 2t) * - sin (1 - 2t) * -2
= 8 * cos³ (1 - 2t) * sin (1 - 2t)