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A box contains disk which are numbers 2,2,3,3,3,4,5. Daniel takes one disk at random from the box, then takes another without replacement. what is the probability of the second disk being a 2 (ans is 11/42) i keep getting 12/42, i think i may be doing sth rong? please help and explain. :D

I need help understanding this question I have the teachers solution but i dont understand the actual integrating part Int (cos x sin x) / (2-sin(^2) x)^-0.5 dx ie. i dont get the part where you: [ Int u(2-u^2)^-0.5 du ] please explain. thx in advance

Taken from a Trial: A missile is released from a plane flying horizontally at a height of 500 m and at a constant speed of 300m/s (i) Show that the equation of the horizontal component of the subsequent motion of the missile is given by x=300t, where t is time and x is horizontal displacement...