Trigonométrie Flashcards

1
Q

Formules d’addition cos, sin, tan

A

cos(a-b)=cosacosb+sinasinb
cos(a+b)=cosacosb-sinasinb
sin(a-b)=sinacosb-sinbcosa
sin(a+b)=sinacosb+sinbcosa
tan(a+b)=(tan(a)+tan(b))/(1-tan(a)tan(b))
tan(a-b)=(tan(a)-tan(b))/(1+tan(a)tan(b))

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2
Q

cos(2a)

A

=cos²a-sin²a=2cos²a-1=1-2sin²a

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3
Q

sin(2a)

A

=2cosasina

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4
Q

tan(2a)

A

2tana/(1-tan²a)

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5
Q

Relation entre cos et sin

A

cos(pi/2 - x)=sinx
sin(pi/2 - x)=cosx
cos^2+sin^2=1

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6
Q

tan’x

A

=1/cos²x

=1+tan²x

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7
Q

arcsin’x

A

=1/sqrt(1-x²)

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8
Q

arccos’x

A

= -1/sqrt(1-x²)

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9
Q

arccosx+arcsinx

A

=pi/2

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10
Q

arctan’x

A

1/(1+x²)

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11
Q

limites arctan

A

-pi/2 et pi/2

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12
Q

arctanx+arctan(1/x)

A

= pi/2 si x est positif non nul

= -pi/2 si x est négatif non nul

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13
Q

ch(x)

A

=(e^x+e^-x)/2

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14
Q

sh(x)

A

=(e^x-e^-x)/2

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15
Q

ch’

A

sh

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16
Q

sh’

A

ch

17
Q

th’

A

1/ch²

=1-th²

18
Q

ch²-sh²

A

1

19
Q

Cotan

A

1/tan

=cos/sin

20
Q

Cotan’

A

-1/sin^2

21
Q

Primitive tan x

A

-ln(cosx)

22
Q

Primitive cotan

A

ln(sinx)