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Dado \( \operatorname{Cos} B=0.3148 \) ¿Cuál es el valor numérico de Cot \( A \) ?

Ask by Stuart Weston. in Mexico
Feb 19,2025

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Answer

cot A ≈ 3.017

Solution

Asumamos que A y B son los ángulos agudos de un triángulo rectángulo, de modo que se cumple que   A + B = 90°. Esto implica que   A = 90° – B. Recordando que la cotangente de un ángulo es el cociente del coseno y el seno, y aprovechando que   cot A = cot(90° – B) = tan B, podemos obtener cot A calculando tan B. Sabemos que   cos B = 0.3148, y dado que B es agudo, su seno es positivo. Usamos la identidad:   sin²B + cos²B = 1 ⟹ sin B = √(1 – cos²B). Realizamos el cómputo:   cos²B = (0.3148)² ≈ 0.0991,   sin B = √(1 – 0.0991) = √(0.9009) ≈ 0.9497. Ahora, tan B es:   tan B = sin B / cos B ≈ 0.9497 / 0.3148 ≈ 3.017. Por lo tanto, el valor numérico de cot A es aproximadamente 3.017.

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Para encontrar el valor de \(\cot A\), primero utilizamos la identidad que relaciona el coseno y el seno en un triángulo. Sabemos que en un triángulo, \(\cot A = \frac{\cos A}{\sin A}\). Además, podemos aprovechar el complemento de los ángulos: \[ \cos B = \sin(90^\circ - A) \] Dado que \(\cos B = 0.3148\), esto significa que: \[ \sin A = 0.3148 \] Para calcular \(\cot A\), tenemos que encontrar \(\cos A\). Podemos usar la identidad pitagórica: \[ \sin^2 A + \cos^2 A = 1 \] Sustituyendo \(\sin A\): \[ (0.3148)^2 + \cos^2 A = 1 \] Calculando: \[ 0.0991 + \cos^2 A = 1 \] Por lo tanto: \[ \cos^2 A = 1 - 0.0991 = 0.9009 \] Así obtenemos que: \[ \cos A = \sqrt{0.9009} \approx 0.949 \] Finalmente, calculamos \(\cot A\): \[ \cot A = \frac{\cos A}{\sin A} \approx \frac{0.949}{0.3148} \approx 3.01 \] Por lo tanto, el valor numérico de \(\cot A\) es aproximadamente \(3.01\).

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