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Popular Trigonometría >

3cos(45)+4cos(y)=3

Solución

3 cos (4 5^{\circ}) + 4 cos (y) = 3

Solución

y = 1.34932 \dots + 36 0^{\circ} n, y = 36 0^{\circ} - 1.34932 \dots + 36 0^{\circ} n

Radianes

y = 1.34932 \dots + 2 πn, y = 2 π - 1.34932 \dots + 2 πn

Pasos de solución

3 cos (4 5^{\circ}) + 4 cos (y) = 3

cos (4 5^{\circ}) = \frac{2}{2}

cos (4 5^{\circ})

Utilizar la siguiente identidad trivial:

cos (4 5^{\circ}) = \frac{2}{2}

cos (4 5^{\circ})

cos (x)

tabla de valores periódicos con

36 0^{\circ} n

intervalos:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{2}{2}

= \frac{2}{2}

3 \cdot \frac{2}{2} + 4 cos (y) = 3

Desplace

3 \frac{2}{2}

a la derecha

3 \cdot \frac{2}{2} + 4 cos (y) = 3

Restar

3 \frac{2}{2}

de ambos lados

3 \cdot \frac{2}{2} + 4 cos (y) - 3 \cdot \frac{2}{2} = 3 - 3 \cdot \frac{2}{2}

Simplificar

3 \cdot \frac{2}{2} + 4 cos (y) - 3 \cdot \frac{2}{2} = 3 - 3 \cdot \frac{2}{2}

Simplificar

3 \cdot \frac{2}{2} + 4 cos (y) - 3 \cdot \frac{2}{2} : 4 cos (y)

3 \cdot \frac{2}{2} + 4 cos (y) - 3 \cdot \frac{2}{2}

Sumar elementos similares:

3 \frac{2}{2} - 3 \frac{2}{2} = 0

= 4 cos (y)

Simplificar

3 - 3 \cdot \frac{2}{2} : 3 - \frac{3 2}{2}

3 - 3 \cdot \frac{2}{2}

Multiplicar

3 \cdot \frac{2}{2} : \frac{3 2}{2}

3 \cdot \frac{2}{2}

Multiplicar fracciones:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{2 \cdot 3}{2}

= 3 - \frac{3 2}{2}

4 cos (y) = 3 - \frac{3 2}{2}

4 cos (y) = 3 - \frac{3 2}{2}

4 cos (y) = 3 - \frac{3 2}{2}

Dividir ambos lados entre

4

4 cos (y) = 3 - \frac{3 2}{2}

Dividir ambos lados entre

4

\frac{4 cos ( y )}{4} = \frac{3}{4} - \frac{\frac{3 2}{2}}{4}

Simplificar

\frac{4 cos ( y )}{4} = \frac{3}{4} - \frac{\frac{3 2}{2}}{4}

Simplificar

\frac{4 cos ( y )}{4} : cos (y)

\frac{4 cos ( y )}{4}

Dividir:

\frac{4}{4} = 1

= cos (y)

Simplificar

\frac{3}{4} - \frac{\frac{3 2}{2}}{4} : \frac{6 - 3 2}{8}

\frac{3}{4} - \frac{\frac{3 2}{2}}{4}

Aplicar la regla

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{3 - \frac{3 2}{2}}{4}

Simplificar

3 - \frac{3 2}{2}

en una fracción:

\frac{6 - 3 2}{2}

3 - \frac{3 2}{2}

Convertir a fracción:

3 = \frac{3 \cdot 2}{2}

= \frac{3 \cdot 2}{2} - \frac{3 2}{2}

Ya que los denominadores son iguales, combinar las fracciones:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{3 \cdot 2 - 3 2}{2}

Multiplicar los numeros:

3 \cdot 2 = 6

= \frac{6 - 3 2}{2}

= \frac{\frac{6 - 3 2}{2}}{4}

Aplicar las propiedades de las fracciones:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{6 - 3 2}{2 \cdot 4}

Multiplicar los numeros:

2 \cdot 4 = 8

= \frac{6 - 3 2}{8}

cos (y) = \frac{6 - 3 2}{8}

cos (y) = \frac{6 - 3 2}{8}

cos (y) = \frac{6 - 3 2}{8}

Aplicar propiedades trigonométricas inversas

cos (y) = \frac{6 - 3 2}{8}

Soluciones generales para

cos (y) = \frac{6 - 3 2}{8}

cos (x) = a \Rightarrow x = arccos (a) + 36 0^{\circ} n, x = 36 0^{\circ} - arccos (a) + 36 0^{\circ} n

y = arccos (\frac{6 - 3 2}{8}) + 36 0^{\circ} n, y = 36 0^{\circ} - arccos (\frac{6 - 3 2}{8}) + 36 0^{\circ} n

y = arccos (\frac{6 - 3 2}{8}) + 36 0^{\circ} n, y = 36 0^{\circ} - arccos (\frac{6 - 3 2}{8}) + 36 0^{\circ} n

Mostrar soluciones en forma decimal

y = 1.34932 \dots + 36 0^{\circ} n, y = 36 0^{\circ} - 1.34932 \dots + 36 0^{\circ} n

Gráfica

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