Trigonometry › Negative angle identities

Teacher info
Simplify trig functions of negative angles
CCSS.MATH.CONTENT.HSF.TF.A.4
(+) Use the unit circle to explain symmetry (odd and even) and periodicity of trigonometric functions.

LTI launch URL (help)
https://schoolyourself.org/page/lti/sy/trigonometry/trig_identities_negative
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