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sin(4x)cos(2x)-sin(2x)cos(4x) is equivalent to which of the following?

 

A. sin(2x)

B. None of these

C. sin(6x)

D. cos(2x)

E. cos(6x)

Deathstroke_rule  Apr 26, 2017
 #1
avatar+89775 
+2

sin(4x)cos(2x)-sin(2x)cos(4x)

 

Using 

 

sin ( A - B) =   sinAcosB - sinBcosA   where  A  = 4x   and B  = 2x, we have

 

sin ( 4x  - 2x)  =

 

sin (2x)   →    "A"

 

 

 

cool cool cool

CPhill  Apr 26, 2017

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