Question

cosx =-1/2 find x?

Answer 1

take the arc cosine of both sides

Answer 2

What?

Answer 3

Keep it with you :)

Answer 4

Find the degree of the circle where \(x = \Large {-1 \over 2}\).

Answer 5

is there any method to find it.... thxx for the pic

Answer 6

here's a hint \[\cos x = 1\]
\[\cos^{-1} (\cos x ) = \cos^{-1} 1\]
\[x = \cos^{-1} 1\]
\[x = 0\]

Answer 7

I don't see \(\cos 0 = \Large{-1 \over 2}\)

Answer 8

that's how you do what i said "take the arc cos of both sides"

Answer 9

\[\cos 0 = 1 \ne {-1 \over 2} \]

Answer 10

who said it was -1/2 o.O

Answer 11

The question.

Answer 12

i meant who said cos 0 = -1/2?

Answer 13

Your solution says \(x = 0\).

Answer 14

lol look at the start of my solution

Answer 15

I see.

Answer 16

You still can't evaluate \(\cos ^{-1}({-1 \over 2})\) without using a calculator/unit circle.