How to Cite "Double‐Angle and Half‐Angle Identities" from CliffsNotes.com:

CliffsNotes.com. Double‐Angle and Half‐Angle Identities. 16 Sep 2014
<http://www.cliffsnotes.com/math/trigonometry/trigonometric-identities/double-angle-and-half-angle-identities>.



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