trigonetry

trigonetry

1. tan x = opposite / adjacent

2. cos x = adjacent / hypotenuse

3. sin x = opposite / hypotenuse

4. exact values

   • sin 30 = ½
   • cos 30 = √3 / 2
   • tan 30 = 1 / √3
   • sin 60 = √3 / 2
   • cos 60 = ½
   • tan 60 = √3
   • sin 45 = 1 / √2
   • cos 45 = 1 / √2
   • tan 45 = 1
   • sin 0 = 0
   • cos 0 = 1
   • tan 0 = 0
   • sin 90 = 1
   • cos 90 = 0

5. for 3D trig, make a right angled triangle with the line and the plane, then do normal stuff