Chapter 5
Chapter 5
Chapter 5
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Verifying symmetry of sine, cosine, and tangent functions<br />
Theorem (Identities due to symmetry)<br />
sin(−t) = − sin(t)<br />
cos(−t) = cos(t)<br />
tan(−t) = − tan(t)<br />
Proof. Let (x, y) be a point on the Unit circle.