Answer :
Answer:
Since
sin
2
x
=
2
sin
x
cos
x
, than:
sin
4
x
=
2
sin
2
x
cos
2
x
=
2
⋅
2
sin
x
cos
x
⋅
cos
2
x
=
4
sin
x
cos
x
cos
2
x
.
Answer:
Since
sin
2
x
=
2
sin
x
cos
x
, than:
sin
4
x
=
2
sin
2
x
cos
2
x
=
2
⋅
2
sin
x
cos
x
⋅
cos
2
x
=
4
sin
x
cos
x
cos
2
x
.