Question

Решить урfвнение
a)cos5x+0.5=0
б)ctg(п/5-x)+1=0

Answer 1

а) cos5x = -0,5
5x = +- arccos(-0,5) + 2πn
5x = +- 2π/3 +2πn
x = +- 2π/15 + 2πn/5
б) ctg(π/5-x)=-1
π/5-x=arcctg(-1) + πn
x = -11π/20 +πn