Yefim S. answered • 06/01/21
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cos2(4x) = (1 + cos(8x))/2
Camila J.
asked • 06/01/21Use a half angle or reduction formula to fill in the blanks in the identity below:
Use a half angle or reduction formula to fill in the blanks in the identity below:
( cos ( 4 x ) )^2____ = + ____ cos ( x )
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