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