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F(x)= -3sen(4-x)(-1) + 3sec^2(ln(2x))(2x)'/2x
F(x)= 3sen(4-x) + 3sec^2(ln(2x))(2)/(2x)
F(x)= 3sen(4-x) + 3 sec^2(ln(2x))/x....Rta