Question

Solve the equation in the specified interval
Secx=-3 -pi
11 years ago

Answer 1

HI!!

Answer 2

start with \[\cos(x)=-\frac{1}{3}\]

Answer 3

then comes some difficulty

Answer 4

Hey! Yes I started with that

Answer 5

so now you are stuck since you don't know the answer to that

Answer 6

Basically I'm stuck in this step

Answer 7

you need to use a calculator to find
\[\cos^{-1}(-\frac{1}{3})\]

Answer 8

that will only give you one answer in quadrant 2 though

Answer 9

Ok I got it

Answer 10

you want the other one, it is the negative of the first one

Answer 11

So first one is 1.91

Answer 12

hmm let me check

Answer 13

http://www.wolframalpha.com/input/?i=arccos%28-1%2F3%29
yeah looks good

Answer 14

Ok so how do I get the opposite

Answer 15

it is the negative of the first one

Answer 16

-1.91?