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Oct 16th, 2017

S = 4pi r^2 = 4pi*(7/8 t^3)^2 

=4pi*49/64 t^6  

= 49/16 pi * t^6

at t  =2 

S(2) = 49/16*pi*2^6 

= 49*4*pi = 196 pi 

Apr 5th, 2015

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