Solve the equation:

cos x( cos x - 1) = 0

Question

Solve the equation:

cos x( cos x - 1) = 0

anonymous · Answer

solve 
cosx = 0    &
cosx - 1 = 0

anonymous · Answer

huh?

anonymous · Answer

solve each of the above equations

anonymous · Answer

im asking for help...

anonymous · Answer

yes, he is helping you!

anonymous · Answer

when 2 functions are multiplied together and the answer is 0 as we have here
then either one of them can be equal to 0

anonymous · Answer

You just have to take inverse cosine in each of the above equations, that's all.

anonymous · Answer

cosx = 0    &
cosx - 1 = 0  same as cosx = 1

find inverse cosine of 0 and 1, those are your answers

anonymous · Answer

I got π/2, 3π/2, 0

anonymous · Answer

you got 3 answer?!

anonymous · Answer

what did you get?

anonymous · Answer

Do you have to do this in radians or degrees?

anonymous · Answer

radians.

anonymous · Answer

I don't have a calc by me, but you can set your calc into radians, and calculate the following 2 things:

inverse cosine of 1 and 0.

Or you can't use calc?
I know that pi is equal to 180, right?

anonymous · Answer

inverse cosine of 0 = 90
inverse cosine of 1= 0

anonymous · Answer

^according to calculator.

anonymous · Answer

Did you set your calc into radians b4 calculating the inverse cosines?

anonymous · Answer

Oh oops. No I forgot lol.

anonymous · Answer

inverse cosine of 0 = 1.570796327
inverse cosine of 1=0

anonymous · Answer

Alright so the answers are pi/2 and 0.

anonymous · Answer

Yup!

anonymous · Answer

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anonymous · Answer

thanks lol