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Which expression is equivalent to cos(4x)+cos(2x)
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Which expression is equivalent to cos(4x)+cos(2x)

User Ojblass
by
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1 Answer

1 vote

Answer:

2*cos(3x)*cos(x)

Explanation:

cos(4x) + cos(2x)

=cos(3x+x) + cos(3x-x)

Formula: cosx cosy=1/2(cos(x+y)+cos(x-y))

Here, x will be 3x according to formula and y will be equal to x

So, cos(3x+x) + cos(3x-x)

=2*cos(3x)*cos(x)

User Prisoner
by
6.2k points
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