Find the general solution for each of the following equations:
$$
\cos 4 x=\cos 2 x
$$

Answer

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Precalculus

NCERT Class 11 - Math

Chapter 3

Trigonometric Functions

Section 4

Trigonometric Functions of Sum and Difference of Two Angles

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Video Transcript

aggression is given course for X equal to of course two eggs. So here we have to find the general solution of this aggression. The situation you can written us goes for X negative calls to X equal to zero. So here we have a formula for goals. E negative Cosby equal to two times three negative two times sane A positive B upon to times sine a negative be upon to. So now we apply that formula here so we get negative two times sane four X plus two X upon to times saying four X. Negative two X upon to equal to zero. So now we simplify this. And here we get negative two times sign three X. Thanks sign X equal to zero. So here sane three X equal to zero. Or sane X equal to zero. By quoting the values we get for signed three X equal to zero three X equal to. And by plus negative one to the power and times you. So here we get three X equal to and by. So here X equal to and by upon three. And for cynics equal to zero, X equal to and by first negative one to the power and time zero. So here we get X equal to and by where an element off said. And here that is indigent, therefore general solution or X equal to and by upon three and X equal to and by where an element of said, so it is over final answer.

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