1)y = ln(cos(3x)) + ln(x^2/(1-x^2))
y' = (-sin(3x)/cos(3x)*3) + (2/x - 2/(1-x^2))y' = -3tan(3x) + 2/x - 2/(1-x^2)
2)y = ln(x/a) - ln(a/x)
y' = (1/(x/a) (1/a)) - (-1/(a/x) (1/x))y' = 1/a^2 - 1/x^2y' = (x^2 - a^2)/(a^2x^2)
1)
y = ln(cos(3x)) + ln(x^2/(1-x^2))
y' = (-sin(3x)/cos(3x)*3) + (2/x - 2/(1-x^2))
y' = -3tan(3x) + 2/x - 2/(1-x^2)
2)
y = ln(x/a) - ln(a/x)
y' = (1/(x/a) (1/a)) - (-1/(a/x) (1/x))
y' = 1/a^2 - 1/x^2
y' = (x^2 - a^2)/(a^2x^2)