- #1
Plutonium88
- 174
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√
cos√x = cosx SOLVE
cos√x = cosx
square both sides
cos√x*cos√x = cosx*cosx
cosx = cosx^2
cosx^2 - cosx = 0
cosx(cosx - 1) = 0
cosx = 0 cosx = 1
x=2Pin, NEI
x = pi/2 + 2PIn, Nei
however this is terribly wrong my teacher said, and she told me that the answer is something crazy. and yea.. I'm a newb so please help me.
Homework Statement
cos√x = cosx SOLVE
Homework Equations
The Attempt at a Solution
cos√x = cosx
square both sides
cos√x*cos√x = cosx*cosx
cosx = cosx^2
cosx^2 - cosx = 0
cosx(cosx - 1) = 0
cosx = 0 cosx = 1
x=2Pin, NEI
x = pi/2 + 2PIn, Nei
however this is terribly wrong my teacher said, and she told me that the answer is something crazy. and yea.. I'm a newb so please help me.
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