guccigriff
guccigriff
14-03-2021
Mathematics
contestada
Sin 4x=4sinx times cos x times cos 2x
Respuesta :
kcmabanasanchez
kcmabanasanchez
14-03-2021
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
.
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