The expression ("cos" 4x+"cos" 3x+"cos"2...

The expression `("cos" 4x+"cos" 3x+"cos"2x)/("sin" 4x+"sin" 3x+ "sin" 2x)` is equal to

A

`-cot 3x`

B

cot 3x

C

cot 2x

D

`-cat 2x`

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The correct Answer is:

B

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