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Could someone please explain to me how they got from the first step to the second? sin pi/35 t = 0 pi/35 t = pi hence t = 35 minutes.... Thank you in advance ^^

Hurro~! ^^ I'm stuck with this Maths in focus question, Exercise 6.2 Q30 A rectangular block of ice with a square base has a height half the side of the base. As it melts, the volume of the block of ice is decreasing at the rate of 12 cm3s-1. Find the rate at which its surface area will be...