SOLUTION: cos4x=(-sqrt3)/2

Question 1029962: cos4x=(-sqrt3)/2
Answer by ikleyn(52914) (Show Source): You can put this solution on YOUR website!
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cos4x=(-sqrt3)/2
~~~~~~~~~~~~~~~~~~~~

cos(4x) =   --->  

4x = ,  k = 0, +/-1, +/-2 . . .  (1)

or

4x = , k = 0, +/-1, +/-2 . . .  (2)


From (1):  x = ,  k = 0, +/-1, +/-2 . . .

From (2):  x = ,  k = 0, +/-1, +/-2 . . .

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