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Sagot :


Comme sin² + cos²= 1, Alors:

sinC² + cosC² = 1

0.81² + cosC² = 1

cosC²= 1 - 0.6561

cosC²= 0.3439

cosC= √0.3439

cosC= (environ) 0.59

Comme tanA= sinA/cosA, Alors:

tanA= 0.81/0.59

tanA= (environ) 1.37





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