Examen 2 -- Les vecteurs Flashcards

1
Q

a + b =

A

[a1 + b1 a2+b2]

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2
Q

angle entre deux vecteurs algébriques ° =

A

arccos(a1b1 + a2b2)

||a|| ||b||

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3
Q

projection orthogonal a­ b

A

a x b x b

||b||²

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4
Q

projection orthogonal a­ b

A

(a x b/||b||²) x b

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5
Q

base orthogonale

A

2 vecteurs, lin indédep, perpendiculaire

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6
Q

distance entre deux droites parallèles

A

d = |(P1P2 x n1)|

||n1||

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7
Q

distance entre un point et une droite

A

d = |(QP x n)|

||n||

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8
Q

angle entre deux droites concourantes

A

° = arccos d1 x d2

||d1|| ||d2||

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9
Q

inverse catésienne nb complexe 1/z =

A

conjugué

||z||²

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10
Q

division cartésienne nb complexe z1/z2 =

A

z1 x conjuguéz2

||z2||²

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11
Q

division cartésienne nb complexe z1/z2 =

A

z1 x conjuguéz2 / ||z2||²

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12
Q

formule Moivre racine ze1/n =

A

pe1/n cis °+2kpi

n

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13
Q

formule Moivre racine ze1/n =

A

pe1/n cis (°+2kpi/n)

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