Simplify this expression with \cos and \sin \frac{\cos12x}{\cos4x}-\frac{\sin12x}{\sin4x}=\frac{\cos^2 6x-\sin^2 6x}{\cos^2 2x-\sin^2

Essence Byrd

Essence Byrd

Answered question

2022-04-25

Simplify this expression with cos and sin
cos12xcos4xsin12xsin4x=cos26xsin26xcos22xsin22x2sin6xcos6x2sin2xcos2x

Answer & Explanation

haarplukxjf

haarplukxjf

Beginner2022-04-26Added 16 answers

You should first note that setting 4x=y gives
cos12xcos4xsin12xsin4x=cos3ycosysin3ysiny
Now you can make a common denominator and use the subtraction formula or recall that
cos3y=4cos3y3cosy
sin3y=3siny4sin3y
and the formula simplifies nicely
cos3ycosysin3ysiny=4cos2y33+4sin2y
=4(cos2y+sin2y)6
=2

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