| Term | Definition |
|---|---|
What is tan(θ)? | sin(θ)/cos(θ) |
When is tan(θ) undefined? | When cos(θ) = 0 |
What is the Pythagorean identity? | sin²(x) + cos²(x) = 1 |
What does sin²(x) mean? | (sin(x))² |
What is sin²(x) equal to? | 1 − cos²(x) |
What is cos²(x) equal to? | 1 − sin²(x) |
What is 1 + tan²(x) equal to? | sec²(x) |
What is 1 + cot²(x) equal to? | csc²(x) |