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igomit [66]
3 years ago
9

Si: Tg θ =√2 ∧ θ es agudo √7 Calcular: A = 3(Sen θ + Cos θ) - √7

Mathematics
1 answer:
Harlamova29_29 [7]3 years ago
3 0

Answer:

A \approx 1.488

Step-by-step explanation:

Por definición de razones trigonométricas, tenemos las siguientes identidades:

\tan \theta = \frac{y}{x} = \sqrt{2} (1)

\sin \theta = \frac{y}{\sqrt{x^{2}+y^{2}}} (2)

\cos \theta = \frac{x}{\sqrt{x^{2}+y^{2}}} (3)

Si \theta es agudo, entonces x, y > 0.

De (1), suponemos x = 1 que y = \sqrt{2}, entonces los valores de las funciones seno y coseno:

\sin \theta = \frac{\sqrt{2}}{\sqrt{5}} = \sqrt{\frac{2}{5} }

\sin \theta = \frac{\sqrt{10}}{5 }

\cos \theta = \sqrt{\frac{1}{5} }

\cos \theta = \frac{\sqrt{5}}{5}

Por último, calculemos A:

A = 3\cdot \left(\frac{\sqrt{10}}{5} + \frac{\sqrt{5}}{5}  \right) - \sqrt{7}

A \approx 1.488

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