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=-1b=-π/2+2πn,n∈zb={-π/2;-3π/2;3π/2} b)cos b=1b=2πn,n∈zb={0;2π;-2π} c)cos b=0b=π/2+πn,n∈zb={π/2;3π/2;-π/2} d)ctg b=0 b=π/2+πn,n∈zb={π/2;3π/2;-π/2}