1. f (x) = cos x, x0 = П (пи)
2. f (x) = 2 / x - 1, x0 = -1
3. y = ( x^2 - 1) ( x^3 + x )
4.y = x - 1 \x + 1 + x + 1/ x - 1
5. y = 2x^2 + 1 \ x^2 - 1
1. 0 2. -2 3. 5^4-x^2 4. 5. -6x