Question

solve the equation for 0 14 years ago

Answer 1

Now substitute the value of cos45=1/sqrt(2)

Answer 2

how did you get to that?

Answer 3

sorry, im still confused

Answer 4

oh! so it comes to be 2cosx (root2/2)=root2

Answer 5

The value of cos45 is a standard value. You should know it.
\[2cosxcos45=2cosx(1/\sqrt{2})=\sqrt{2}cosx\]
Now proceed

Answer 6

ohh. so it ends up being cosx=root2/root2 so cosx=1?

Answer 7

Yes. Now, do you know how to find the values for x?

Answer 8

0 and 360 degrees?

Answer 9

Yes. The general solution of cosx=1 is x=2nPI

Answer 10

thank you!