trigonometric identites and solving

• cos x

• sin x

• tan x

• csc x

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

• 150 and 210

• 120 and 240

• 30 and 330

• 30 and 150

• 0 and 180

• 135 and 315

• 135 and 225

• 225 and 315

• 45 and 135

• 45 and 225

• 60 and 240

• 120 and 240

• 60 and 150

• 210 and 300

• 30 and 150