diff --git a/education/math/MATH1060 (trig)/Identities.md b/education/math/MATH1060 (trig)/Identities.md index 827001f..94c2ae6 100644 --- a/education/math/MATH1060 (trig)/Identities.md +++ b/education/math/MATH1060 (trig)/Identities.md @@ -23,5 +23,10 @@ $$ cot^2 \theta + 1 = csc^2\theta $$ # Even and Odd Identities - A function is even if $f(-x) = f(x)$. - A function is odd if $f(-x) = -f(x)$ -Cosine and secant are **even* +- Cosine and secant are **even** +- Sine, tangent, cosecant, and cotangent are **odd**. ## Examples +> If $cot\theta = -\sqrt{3}$, what is $cot(-\theta)$? + +$cot$ is an odd function, and so $cot(-\theta) = \sqrt{3}$ +