Question

solve the following equation 4 c0s^4 x -1 =0

Answer 1

hello

Answer 2

hi

Answer 3

\[4\cos^4(x)-1=0\]

Answer 4

r u looking for a numerical solution?

Answer 5

like x= pi + 2npi and 3pi/2 + 2npi

Answer 6

ok cool

Answer 7

http://www.wolframalpha.com/input/?i=+4+cos^4+x+-1+%3D0

Answer 8

Happy Studying!

Answer 9

thank you

Answer 10

just in case
http://www.wolframalpha.com/input/?i=+4+cos%5E4+%28x%29+-1+%3D0

Answer 11

why not just do it the old fashion way... before wolfram alpha

\[4 \cos^4(x) = 1\]

\[\cos^4(x) = \frac{1}{4}\]

then

\[\cos(x) = \pm \sqrt[4]{\frac{1}{4}}\]

so then

\[x = \pm \cos^{-1} \frac{1}{\sqrt[4]{4}}\]

hope it makes sense

Answer 12

thank you for your help