(i)
Y= 1/c-t+t2
dy/dt = (1-2t) y2
dy/dt =-1/(c-t+t2)2 ×(-1+2t)
= (1-2t)×1/(c-t+t2)2
dy/dt =(1-2t)×y2 => answer
(ii)
y = 1/(c+cost),
dy/dt= -1/(c+cost)2×(-sint),
dy/dt =(sint)y2 => answer
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