Question

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

Answer 1

Explanation:

sin(a+b)=sin(a)cos(b)+cos(a)(sin(b)

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

sin(2x+2x)=sin(2x)×cos(2x)+cos(2x)×sin(2x)

simplified to

2sin(2x)cos(2x)

Answer 2

2=4x/2x

2=2x

x=2/2

x=1