Serious help to solve this solving trigonometric identities

Ivory James

New member
Joined
Nov 23, 2021
Messages
1
I have no clue how to go on with this question despite substituting with the identities besides that I'm lost.

Solve: cos x = - cos 2x - 2 sin 2x + sin x + 1
for x ∈ [- 180, 180]
the 180's are in degrees

Thank you so much in advance
 

lev888

Elite Member
Joined
Jan 16, 2018
Messages
2,677
I have no clue how to go on with this question despite substituting with the identities besides that I'm lost.

Solve: cos x = - cos 2x - 2 sin 2x + sin x + 1
for x ∈ [- 180, 180]
the 180's are in degrees

Thank you so much in advance
Post your work.
 

Jomo

Elite Member
Joined
Dec 30, 2014
Messages
11,486
You need to try something!
Can you get all the angles to just be x (no 2x's)?
 
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