1.1: Trig & Inverse Trig with Special Angles (MEMORIZE)
tan(45°) or tan(π/4)
1
cos(60°) or cos(π/3)
1/2
sin(30°) or sin(π/6)
1/2
secθ (quadrant angle)
1/x
cscθ (quadrant angle)
1/y
arccos(√3/2) or cos⁻¹(√3/2) (reference angle)
30° or π/6
arcsin(1/2) or sin⁻¹(1/2) (reference angle)
30° or π/6
arctan(√3/3) or tan⁻¹(√3/3). (reference angle)
30° or π/6
arccos(√2/2) or cos⁻¹(√2/2). (reference angle)
45° or π/4
arcsin(√2/2) or sin⁻¹(√2/2). (reference angle)
45° or π/4
arctan(1) or tan⁻¹(1). (reference angle)
45° or π/4
arccos(1/2) or cos⁻¹(1/2) (reference angle)
60° or π/3
arcsin(√3/2) or sin⁻¹(√3/2) (reference angle)
60° or π/3
arctan(√3) or tan⁻¹(√3). (reference angle)
60° or π/3
cosθ
adj/hyp
cotθ
adj/opp
secθ
hyp/adj
cscθ
hyp/opp
tanθ
opp/adj
sinθ
opp/hyp
cos θ (quadrant angle)
x/1
cotθ (quadrant angle)
x/y
sin θ (quadrant angle)
y/1
tanθ (quadrant angle)
y/x
cos(45°) or cos(π/4)
√2/2
sin(45°) or sin(π/4)
√2/2
tan60° or tan(π/3)
√3
cos(30°) or cos(π/6)
√3/2
sin60⁰ or sin(π/3)
√3/2
tan30° or tan(π/6)
√3/3