Phương trình lượng giác: Difference between revisions

From testwiki
Jump to navigation Jump to search
imported>JohnsonLee01
 
(No difference)

Latest revision as of 02:02, 5 July 2020

  • cosθ=0
θ=π2,3π2,...,(2n+1)π2
  • sinθ=0
θ=0,π,2π,...,nπ