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Find all degree solutions for the following cos4(theta)=-1
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`cos4 x=- 1` means the argument of the function cos is an angle has cosin = -1
so angle wit cosin = -1 is only `pi` and congruent a round:
`4x= pi+ 2k pi` so that: `x= pi/4 +k pi/2` `k =0,1,2....`
Posted by oldnick on April 10, 2013 at 3:52 AM (Answer #1)
If you mean `cos(4theta)=-1`
`theta=(np)/2+-pi/4` ,where n is an integer.
If you mean `cos^4(theta)=-1` ,then this problem has no solution.
Posted by pramodpandey on April 10, 2013 at 4:03 AM (Answer #2)
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