Question

a

Answer 1

@jim_thompson5910

Answer 2

@karim728

Answer 3

@sshayer

Answer 4

don't yahoo paste plz

Answer 5

out of entire trig this is probably the only thing im struggling with

Answer 6

okay

Answer 7

wellfella, what do i do next?

Answer 8

you want to find only 2x or something else eg,cos 2x?

Answer 9

whatever the question is asking me to do..lol

Answer 10

can you post a screenshot of the full problem?

Answer 11

ok plz wait a sec!! i love you all <3

Answer 12

if only 2x
find arccos x and then multiply by 2.
you have to use calculator

Answer 13

^There!!

Answer 14

ok first thing I'd do is use the trig identity

sin(2x) = 2*sin(x)*cos(x)

see page 2 under double angle formulas

http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

Answer 15

sin 2x=2 sin xcos x

Answer 16

we already know cos(x) = 12/13. So we just need the value of sin(x)

Answer 17

ok

Answer 18

draw a right triangle in quadrant 1

Answer 19

cosine is adjacent over hypotenuse, so we can throw on these labels

Answer 20

are you able to determine the value of y?

Answer 21

\[\cos(x)=\dfrac{12}{13}\,\,and\,\,0<x<90º,\,\,\text{ find the value of (2x)}\] is this? I don't know if this can help you.... but I used arcsin and a calculator, ok?

Answer 22

yes i believe

Answer 23

12/13

Answer 24

hint: pythagorean theorem

Answer 25

Sorry, 45º is the value of 2x, not exactly, ok?