1) (2lnx)' + (6x^7)' = 2(1/x) + 42x^6 = 2/x + 42x^6
2) (sin2x)' - (cosx)' = 2cos2x + sinx
3) (1/x)' - (x/3)' = -1/x^2 - 1/3
1) (2lnx)' + (6x^7)' = 2(1/x) + 42x^6 = 2/x + 42x^6
2) (sin2x)' - (cosx)' = 2cos2x + sinx
3) (1/x)' - (x/3)' = -1/x^2 - 1/3