Prove the following:
$$
\frac{\cos 9 x-\cos 5 x}{\sin 17 x-\sin 3 x}=-\frac{\sin 2 x}{\cos 10 x}
$$

Answer

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Video Transcript

in this kitchen you have to prove that goes nine X nine. To do growth. Five upon sane 17 X negative sane three X. Equal to negative signed to eggs upon close Dynex. So here we have a formula of course, E negative coast B equal to two times which is native. Two times saying A plus V upon to times sign E negative B upon to and sign a negative sign. Be equal to two times goose E blessings be upon to times saying E negative be upon to. Now. Here we take allergies equal to after applying that formula allergies. So here we get negative two times sign nine X. Positive five X upon to games sane nine X. Negative five X upon to upon two times of course 17 eggs falls into three X upon to times sane 17 X. Negative three eggs upon to. So now we simplify this. So here we get 90 sane. So in eggs times site two eggs upon ghost annex times sign. So next. So now we simplify this and here we get Nagy. Do sign to eggs upon goes 10 X. That is the value of oranges. So here Alice is equal to oranges. So here hands screwed and it is over final answer.

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