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September 3, 2015

Homework Help: trig

Posted by marie on Monday, May 28, 2012 at 11:36pm.

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x.
cos 4x


2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4.

sin x/4

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