Exercises: Symmetry and Periodicity of Trigonometric Functions

Grade 9·22 problems·~35 min·Common Core Math - HS Functions·group·hsf-tf-a-4

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Recall / Warm-Up

On the unit circle, the angle $x$ has terminal point $(a, b)$ .
Which expression gives $\cos(x)$ ?

$b$

$a$

$\frac{b}{a}$

$\frac{a}{b}$