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Fleuri
@Fleuri
April 2019
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Besoin d'aide pour cet exo svp
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slyz007
Verified answer
On sait que cos²a+sin²a=1 donc en divisant par cos²a on obtient :
1+tan²a=1/cos²a
<=> tan²a=1/cos²a-1
<=> tan²a=9/5-1=4/5
<=> tana = 2/racinede5
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Bonsoir, j'ai besoin d'aide pour ces exo la svp merci d'avance !
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Verified answer
On sait que cos²a+sin²a=1 donc en divisant par cos²a on obtient :1+tan²a=1/cos²a
<=> tan²a=1/cos²a-1
<=> tan²a=9/5-1=4/5
<=> tana = 2/racinede5