Question

Verify the identity sin 4x= 2 sin 2x cos 2x

Answer 1

Can u help me see what 3\11 is equivalent to

Answer 2

What?

Answer 3

do you know the relation,
\(\sin (a+b)=...?\)

Answer 4

in that you can plug in
a=2x, b=2x

Answer 5

sin (a+b)= sinAcosB + sinBcosA

Answer 6

or would sin (2x +2x)= sin 4x

Answer 7

sin (a+b)= sin a cosb + sinb cos a YES
put a= 2x, b= 2x in this.

sin (2x +2x)= sin 4x YES

Answer 8

so left side become sin 4x
what does right side become ?