Question

Given sin x=-4/5 and x is in the third quadrant, what is the value of tan(x/2)

Answer 1

Do I use the pythagorean theorem to solve it?

Answer 2

Correct!

Answer 3

first find the missing adjacent part using pyth thm

Answer 4

Ok, thanks for the help.

Answer 5

So, I got 6.40? is that correct?

Answer 6

Or you can just find the angle using inverse of sin
sinx=-4/5 ===> x=sin^-1(-4/5)
find the x and divide it by 2
then do tan(x/2)

Answer 7

I'm not sure, i didn't do calculation im just telling how to do this

Answer 8

Ok, thanks for leading me to the answer.

Answer 9

yw!

Answer 10

I got 0.23 as a final answer, is that correct?

Answer 11

i got -1/2 did you do it by degrees or radians?

Answer 12

Degree

Answer 13

You should get what i got?
what did you do?

Answer 14

-0.499 round it to -0.5

Answer 15

i got it like that!

Answer 16

I took the inverse of sin (4/5) then I divided that by two, then I plugged that into tan(x/2)

Answer 17

It said the correct answer was -2, but thanks for the help.

Answer 18

not 4/5! -4/5

Answer 19

Oh... that's why I didn't get it