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OpenStudy (anonymous):
solve for x cos(5x)+cos(2x)=0 all step answer Pi/7 + 4pi/7 k, 3pi/7+ 4pi/7 k, pi/3 + 4pi/3 k, where k=1,2,3,4,....
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OpenStudy (experimentx):
cos 5x = -cos 3x = cos (pi + 3x)
OpenStudy (foolaroundmath):
Hint: Use \[\cos{C} + \cos{D} = 2\cos{\left(\frac{C+D}{2} \right)}\sin{\left(\frac{C-D}{2}\right)}\]
OpenStudy (anonymous):
Can you show all the steps?
OpenStudy (anonymous):
|dw:1342902868975:dw|
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