Укажите несколько значение b,при которых: a)sin b=-1 b)cos b=1 c)cos b=0 d)ctg b=0
A)sin b=-1 b=-π/2+2πn,n∈z b={-π/2;-3π/2;3π/2} b)cos b=1 b=2πn,n∈z b={0;2π;-2π} c)cos b=0 b=π/2+πn,n∈z b={π/2;3π/2;-π/2} d)ctg b=0 b=π/2+πn,n∈z b={π/2;3π/2;-π/2}