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x->0
lim tan 3x (1-(1-2sin^2 x ))
x->0 ----------- . 3x ------------------
3x 4x^3
lim tan 3x 2 sin^2 x
x->0 ----------- . 3x ------------------ .
3x 4x . x^2
= 3x . 2/4x
= 6/4 = 3/2