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Popular Trigonometría >

csc^2(x)+cot^2(x)=3

Solución

csc^{2} (x) + cot^{2} (x) = 3

Solución

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

+1

Grados

x = 4 5^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n, x = 22 5^{\circ} + 36 0^{\circ} n, x = 31 5^{\circ} + 36 0^{\circ} n

Pasos de solución

csc^{2} (x) + cot^{2} (x) = 3

Restar

3

de ambos lados

csc^{2} (x) + cot^{2} (x) - 3 = 0

Re-escribir usando identidades trigonométricas

- 3 + cot^{2} (x) + csc^{2} (x)

Utilizar la identidad pitagórica:

1 + cot^{2} (x) = csc^{2} (x)

cot^{2} (x) = csc^{2} (x) - 1

= - 3 + csc^{2} (x) - 1 + csc^{2} (x)

Simplificar

- 3 + csc^{2} (x) - 1 + csc^{2} (x) : 2 csc^{2} (x) - 4

- 3 + csc^{2} (x) - 1 + csc^{2} (x)

Agrupar términos semejantes

= csc^{2} (x) + csc^{2} (x) - 3 - 1

Sumar elementos similares:

csc^{2} (x) + csc^{2} (x) = 2 csc^{2} (x)

= 2 csc^{2} (x) - 3 - 1

Restar:

- 3 - 1 = - 4

= 2 csc^{2} (x) - 4

= 2 csc^{2} (x) - 4

- 4 + 2 csc^{2} (x) = 0

Usando el método de sustitución

- 4 + 2 csc^{2} (x) = 0

Sea:

csc (x) = u

- 4 + 2 u^{2} = 0

- 4 + 2 u^{2} = 0 : u = 2, u = - 2

- 4 + 2 u^{2} = 0

Desplace

4

a la derecha

- 4 + 2 u^{2} = 0

Sumar

4

a ambos lados

- 4 + 2 u^{2} + 4 = 0 + 4

Simplificar

2 u^{2} = 4

2 u^{2} = 4

Dividir ambos lados entre

2

2 u^{2} = 4

Dividir ambos lados entre

2

\frac{2 u ^{2}}{2} = \frac{4}{2}

Simplificar

u^{2} = 2

u^{2} = 2

Para

x^{2} = f (a)

las soluciones son

x = f (a), - f (a)

u = 2, u = - 2

Sustituir en la ecuación

u = csc (x)

csc (x) = 2, csc (x) = - 2

csc (x) = 2, csc (x) = - 2

csc (x) = 2 : x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn

csc (x) = 2

Soluciones generales para

csc (x) = 2

csc (x)

tabla de valores periódicos con

2 πn

intervalos:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn

csc (x) = - 2 : x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

csc (x) = - 2

Soluciones generales para

csc (x) = - 2

csc (x)

tabla de valores periódicos con

2 πn

intervalos:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

Combinar toda las soluciones

x = \frac{π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

Gráfica

Ejemplos populares

cos(3θ)=(sqrt(3))/2

sin(x+pi/2)+cos^2(x)=0