1) (e^tg3x)' = (e^tg3x) * (tg3x)' = (e^tg3x)*1/Cos3x * (Cos3x)' = = (e^tg3x)*1/Cos3x * (-3Sin3x)
2) 2^x + 2^y=2^xy + 1
3) (log₂Cos² x )' = 1/(Cos²x*ln2) * 2Cosx*(-Sinx)
4) ( (x^2+3x-4) arcSinx )' = (x^2+3x-4)' * arcSinx + (x^2+3x-4)*(arcSinx )'=
=(2x+3)*arcSinx + (x² +3x -4)*1/√(1-х²)