A) -1/(cos(1-x) sen(1-x))
B) 1/cos(1-x) sen(1-x)
C) -tg(1-x)/cos²(1-x)

A) (-e^x+e^-x)/2
B) -e^-x/2
C) (e^x-(e^-x)/2

A) (3x²-6)/(x²+2)²
B) (3x+6)/(x²+2)
C) (-3x²+6)/(x²+2)²

A) (2x³e^x-4x²e^x-e^-x+x²)/2x(x¹/2)
B) (2x³e^x+4x²e^x-e^-x-x²)/2x(x¹/2)
C) (2x²e^x+4x²e^x-e^-x-x²)/2x(x¹/2)

A) -3/2((x⁵)¹/2)
B) 3/2((x⁵)¹/2)
C) -3/-2((x⁵)¹/2)

A) 2x/3((x²+3)²)¹/3
B) 2x/(3((x²-3)²))¹/3
C) 2x/3((x²-3)²)¹/3

A) -2x/(1-x²)¹/2
B) -2x/(2-x²)¹/2
C) 2x/(1-x²)¹/2

A) x/cos2x
B) 0
C) 3(x/(cos²)( 2x))

A) a^3x+2[3(x²-x+1)Ina-2x-1]
B) a^3x+2[3(x²-x+1)Ina+2x-1]
C) a^3x+2[3(x²-x+1)Ina+2x+1]

A) e^x(x-1)
B) e^x(x+1)
C) x+1

A) 20x³-2x³-3
B) 20x³-6x²-3
C) 20x³-2x²-3

A) x(9x-4)
B) -x(9x-4)
C) x(9x+4)