Question

写出与下列各角始、终边相同角的集合.30° 60° 120° -450° -120°

Answer 1

{α|α=30°+k*360°,k∈Z},

{α|α=60°+k*360°,k∈Z},

{α|α=120°+k*360°,k∈Z},

{α|α=-450°+k*360°,k∈Z},

{α|α=-120°+k*360°,k∈Z}