найти f ' (x0)
1. f(x) = tg^2(x)sin(x) x0 = pi/3 

2. f(x) = ln√(6x) x0 = 2

3. f(x) = x^2 ln(x^3) x0 = 1

4. f(x) = ln√(sin3x) x0 = pi/12

5. f(x) = ln(tg3x) x0 = pi/12

6. f(x) = 2√(e^2x + 1) x0 = 0

7. f(x) = 5e^tgx - e^cosx x0 = 0