Precalc Gateway

360 degrees (1 revolution)

2π rad

sin θ

opp/hyp

cos θ

adj/hyp

tan θ

opp/adj

csc θ

1/sin θ

sec θ

1/cos θ

cot θ

1/tan θ

sin²θ + cos²θ =

1

tan²θ + 1 =

sec²θ

1 + cos²θ =

csc²θ

sin (-θ)

-sin θ (odd)

cos (-θ)

cos θ (even)

sin (θ + 2π)

sin θ (show that it's periodic)

cos (θ + 2π)

cos θ (show that it's periodic)