Question

given sinx=-4/5 and x is in the quadant 3 what is the value of tanx/2

I am really bad at trig

Answer 1

do the cos(arcsin(-4/5)

Answer 2

take the negative value of that, and put it under -4/5 as a ratio. Simplify.

Answer 3

@sylbot I got 4/3

Answer 4

that is good. nice job

Answer 5

also another way to do it is to draw the triangle.

Answer 6

You know this is a -3,-4,5 triangle

Answer 7

because it is in the third quadrant

Answer 8

so the answer is -4/-3=4/3, so good job.

Answer 9

This is what its giving me

Answer 10

hahahah no just put in 4/3, youre good. I was just showing work :P

Answer 11

@sylbot gaaahhh its still giving me the same thing, maybe it wants it in decimal form

Answer 12

@sylbot it says the answer is -2

Answer 13

oh whoops I goofed up....

I didn't see the tan(x/2)

Answer 14

I thought it said tan(x)

Answer 15

ok so what you would do is, take arcsin(-4/5)

Divide that by 2. Then take the tangent of that number.

Answer 16

the new angle.

Answer 17

then multiply by -1 to offset the quadrant difference.