Trignometry

Trignometry

1. A branch of mathematics that studies relationship between side lengths and angles of triangles

   • Trignometric ratios
     • Sin=P/H
     • Cos=B/H
     • Tan=P/B
     • Cot=1/tan
     • Sec=1/cos
     • Cosec=1/sin
   • Trignometric ratios of some specific angles
     • Sin
       • 0°=0
       • 30°=1/2
       • 45°=1/under root 2
       • 60°=under root 3/2
       • 90°=1
     • Cos
       • 0°=1
       • 30°=under root 3/2
       • 45°=1/under root 2
       • 60°=1/2
       • 90°=0
     • Tan
       • 90°=not defined
       • 60°=under root 3
       • 45°=1
       • 30°=1/under root 3
       • 0°=0
     • Cosec
       • 0°=not defined
       • 30°=2
       • 45°=under root 2
       • 60°=2/under root 3
       • 90°=1
     • Sec
       • 0°=1
       • 30°=2/under root 3
       • 45°=under root 2
       • 60°=2
       • 90°=not defined
     • Cot
       • 0°=not defined
       • 30°=under root 3
       • 45°=1
       • 60°=1/under root 3
       • 90°=0
   • Trignometric identities
     • Sin(90°-A)=cos A
     • Tan(90°-A)=cotA
     • Sec(90°-A)=cosecA
     • Sin²A+cos²A=1
     • Sec²A-tan²A=1
     • Cosec²A=1+cot²A