Master the Unit Circle: Trigonometric Ratios Made Simple

[@michaelyang4839]

Q1: 3pi/2 < 11pi/6 < 2pi, thus Quadrant 4. 11pi/6 * 180/pi = 330. Ref angle = 30 or pi/6. Sin(pi/6) = 1/2, but because in Quad 4, it is negative : sin(11pi/6) = -1/2
Q2: 9pi/4 = 2pi + pi/4. Tan (pi/4) = 1, thus Tan(9pi/4) = 1

[@solveitwitharash]

Thank you!

[@MehdiRahimi-x8k]

So helpful

[@solveitwitharash]

Thank you!