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trigonometry!!!!!!!!!!!!!!!!

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Find the solution to the nearest angle 

cos A = cos 2A + cos 4A

0 degrees < or = A < or = 360 degrees

asked Jun 26, 2013 in TRIGONOMETRY by rockstar Apprentice

1 Answer

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Given that cosA = cos2A + cos4A

It is in the form of cosc + cosd = cos(c+d)/2cos(c-d)/2

Bring all the terms to one side

Take cosA common

Therefore the required angles are

answered Jun 29, 2013 by jouis Apprentice

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