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2007-03-05 22:06:48 · 3 risposte · inviata da lucignolo 2 in Matematica e scienze Matematica

3 risposte

sin 3x = sin (2x + x) = sin 2x * cos x + cos 2x * sin x
= 2*cos^2 x * sin x + (1 - 2*sin^2x) * sin x
= 2*(1-sin^2 x)* sin x + sin x -2*sin^3 x
= 3*sin x - 4*sin^3 x
= sin x * (3 - 4 sin^2 x)

(è questo che volevi?)

2007-03-06 01:09:13 · answer #1 · answered by Pat87 4 · 2 0

sen 3x= sen(2x+x)= sen2x*cosx+cos2x*senx=
2senxcos^2x+senx (1-2sen^2x)= 2senxcos^2x+senx-2sen^3x=
2senx(1-sen^2x)+senx-2sen^3x= 2senx-2sen^3x+senx-2sen^3x=
3senx-4sen^3x

quindi sen 3x= 3sen(x)-4sen^3(x)

2007-03-06 10:12:51 · answer #2 · answered by mbbbo 3 · 1 0

senx * 1/senx + senx * 1/senx2

2007-03-06 09:00:32 · answer #3 · answered by zuohome 5 · 0 0

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