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phi
 2 years ago
Best ResponseYou've already chosen the best response.1I would add 2 cos x to both sides (think of cos x as just another variable) 4 cos x  2 cos x = 1 + 2 cos x  2 cos x the 2 cos x  2 cos x is 0 4 cos x  2 cos x is 2 cos x. you get 2 cos x = 1 divide both sides by 2

whpalmer4
 2 years ago
Best ResponseYou've already chosen the best response.0Sometimes to aid in thinking of cos x as just another variable, as phi suggests, it's easier to just rewrite the equation: 4c = 1 + 2c 2c = 1 c = 1/2 Now put the cos x back in cos x = 1/2
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