L'île des mathématiques propose des cours et des exercices de maths et de physique.
+ sin²
= 1
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cos (- ) = cos ![]() cos ( - ) = - cos ![]() cos ( + ) = - cos ![]() cos ( - ) = sin ![]() cos ( + ) = - sin |
sin (- ) = - sin ![]() sin ( - ) = sin ![]() sin ( + ) = - sin ![]() sin ( - ) = cos ![]() sin ( + ) = cos |
tan (- ) = - tan cotan (- ) = - cotan
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= 
= 
=
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cos (a - b) = cos a cos b + sin a sin b
sin (a - b) = sin a cos b - cos a sin b cos (a + b) = cos a cos b - sin a sin b sin (a + b) = sin a cos b + cos a sin b tan (a + b) = tan (a - b) =
cos 2a = cos²a - sin²a = 2 cos²a - 1 = 1 - 2 sin²a |
cos² a = sin² a = sin 2a = 2 sin a cos a tan 2a =
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(°) |
0 | 30 | 45 | 60 | 90 |
(rad) |
0 | ![]() |
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sin ![]() |
0 | ![]() |
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1 |
cos ![]() |
1 | |
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0 |
tan ![]() |
0 | |
1 | |
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(cos(a - b) + cos(a + b))
(cos(a - b) - cos (a + b))
(sin(a + b) + sin (a - b))
(sin(a + b) - sin (a - b))