Question

Find the sine, cosine, and tangent of 120 degrees.?

Answer 1

Your a beast!

Answer 2

find \(120^\circ\) on the last page of the attached cheat sheet
then locate the corresponding coordinate on the unit circle
the first coordinate is cosine
the second coordinate is sine
tangent is the second divided by the first

Answer 3

Okay, hold on.

Answer 4

How do I find the coordinates?

Answer 5

@satellite73

Answer 6

with your eyeballs
they are right there on the sheet on the circle
do you see \(120^\circ\)?

Answer 7

Sorry, let me restate my question. I meant to say: how do I find the coordinates if they aren't given?

Ex. FInd the value of sine for 123 degrees?

Answer 8

@satellite73

Answer 9

calculator

Answer 10

What equation would I be using?

Answer 11

you have to type it in to a calculator, you will not find \(\sin(123^\circ)\) without it

Answer 12

http://www.wolframalpha.com/input/?i=sin%28123%29
you will get some decimal

Answer 13

Sin120=sin(90+30)=cos30=√3/2,
Cos120=cos(90+30)=-sin30=1/2,
Tan120=tan(90+30)=-cot30=-√3

Answer 14

120 Degree in 2nd quadrant in 2nd quadrant sin is positive but cos and tan is negative

Answer 15

Sin120=sin(90+30)=cos30=√3/2,
Cos120=cos(90+30)=-sin30=1/2,
Tan120=tan(90+30)=-cot30=-√3