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Find the derivative. s = to cos t - 5t sin t - 5 cost O ds at = - 6t sin t - 5 cost + 5 sin t O ds dt = - to sin t + 6t cost - 5t cost O ds dt = - 16 sint + 6to cost - 5t cost - 10 sin t O ds _ to sin t - 6to cost + 5t cost