trigonometria Flashcards

1
Q

relazione tra radianti e gradi

A

180° : π = X° : X rad

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2
Q

conversione angoli principali

A
5 = π/36
10 = π/ 18
15= π/12
18= π/10
30= π/6
36= π/5
45= π/4
60= π/3
90= π/2
180= π
270= 3π/2
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3
Q

circonferenza goniometrica

A

ha raggio untario e centro nell’origine

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4
Q

seno angolo

A

SOH: lato opposto/ ipotenusa

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5
Q

coseno angolo

A

CAH: lato adiacente/ ipotenusa

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6
Q

tangente angolo

A

TOA: lato opposto/ lato adiacente o seno/coseno

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7
Q

seno di angoli particolari

A

0: 0
30: 1/2
45: √2/2
90: 1

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8
Q

coseno di angoli particolari

A

0: 1
30: √3/2
45: √2/2
60: 1/2
90: 0

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9
Q

tangente di angoli particolari

A

0: 0
30: √3/3
45: 1
60: √3
90: non esiste

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10
Q

archi associati di angoli complementari

A

sen (90 - a) = cos a
cos (90 - a) = sen a
tg (90 - a) = 1/tg a

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11
Q

archi associati si angoli supplementari

A

sen (180 - a) = sen a
cos (180 - a) = -cos a
tg (180 - a ) = -tg a

sen (180 + a) = -sen a
cos (180 + a) = -cos a
tg (180 + a) = tg a

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12
Q

archi associati di angoli opposti/ esplementari

A

sen (-a) = -sen a
cos (-a) = cos a
tg (-a) = - tg a

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13
Q

teorema fondamentale della goniometria

A

sen ^2 + cos^2 = 1

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14
Q

formule somma di archi

A

sen (a + b) = sen a cos b + sen b cos a
cos (a + b) = cos a cos b + sen a sen b
tg (a + b) = (tg a + tg b)/ (1 - tg a tg b)

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15
Q

differenze di archi

A

sen (a - b) = sen a cos b - cos a sen b
cos (a - b) = cos a cos b + sen a sen b
tg (a - b) = (tg a - tg b) / ( 1 - tg a tg b)

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16
Q

duplicazione di archi

A

sen 2a = 2 sen a cos a
cos 2a = cos^2 a- sen^2 a
tg 2a = (2tga) / (1 - tg^2 a)

17
Q

parametriche

A

sen a = (2t) / (1 + t^2)

cos a= (1 - t^2) / (1 + t^2)

18
Q

prostaferesi

A

sen a + sen b = 2 sen (a+b)/2 cos (a-b)/2
sen a - sen b = 2 cos (a+b)/2 sen (a-b)/2
cos a + cos b = 2 cos (a+b)/2 cos (a-b)/2
cos a -cos b = - 2 sen (a+b)/2 sen (a-b)/2

19
Q

Werner

A

sen a cos b = 1/2 [cos (a+b) + sen (a-b)]
cos a cos b = 1/2 [cos (a+b) + cos (a-b)]
sen a sen b = 1/2 [cos (a+b) - cos (a-b)]