2.Find
(a) 2
x
lim -----------
x->0 secx - 1
(b) 2 2
lim x (1+cot 3x)
x->0
(c) 2
d 2 d -1
--------{(x -3x) -----(x+x )}
2
dx dx
(d)Find the tangent and normal lines of the equation tan(xy)=x
at the point(1,pi/4)
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