Question

prove the identity \[2\cos 2\theta+1=\sin \theta \]

Answer 1

?

Answer 2

really not clear
maybe the equation editor would help

Answer 3

\[2\cos 2\Theta +1=\sin \Theta\]

Answer 4

that would be pretty much of a miracle

Answer 5

are you sure that is how it is written
\[\]

Answer 6

no i mean like prove how its true

Answer 7

since for example if \(\theta=0\) the left side is 3 and the right side is 0

Answer 8

something is wrong with your equation mu friend

Answer 9

not solve it i.e. 1/cos=sec ;1/cos=1/cos

Answer 10

an identity has to be true for any x( or other variable you are using)

Answer 11

it is not an identity
in fact it may never be true

Answer 12

:>

Answer 13

you cannot prove something that is not an identity

Answer 14

the other question you asked has the same problem

Answer 15

\[2\cos^2 \theta +1 \] ??

Answer 16

http://www.regentsprep.org/regents/math/algtrig/att9/morepythag.htm

Answer 17

when you say prove we expecting that it is true
and we want a way to show it is
so careful about the question you are asking

Answer 18

its already true we just need to show it

Answer 19

what you wrote cannot be achieved in any way using those identities

Answer 20

oh it is true somewhere i lied

Answer 21

where is it true?

Answer 22

explain please

Answer 23

http://www.wolframalpha.com/input/?i=2cos%282x%29%2B1%3Dsin%28x%29

Answer 24

again if it true for some values, it does not mean it is identity

Answer 25

good luck solving that equation...

Answer 26

eh that is really beyond the question @satellite73

Answer 27

hahaha

Answer 28

.-. its on the worksheet itself it says demonstrate that each identity is true

Answer 29

well, the question is wrong itself
and good luck in answering it :)

Answer 30

if you did "prove it" we would love to see how

Answer 31

maybe there is a typo in the question

Answer 32

the most basic approach to check is what @misty1212 tried from the beginning
when x=0
you will get 3=0 ? and decide for yourself does that make sense