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(625^{cos^2(x)})/(25^{cos(x))}=1

Solución

\frac{62 5 ^{c o s^{2} (x)}}{2 5 ^{c o s (x)}} = 1

Solución

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

Grados

x = 9 0^{\circ} + 36 0^{\circ} n, x = 27 0^{\circ} + 36 0^{\circ} n, x = 6 0^{\circ} + 36 0^{\circ} n, x = 30 0^{\circ} + 36 0^{\circ} n

Pasos de solución

\frac{62 5 ^{c o s^{2} (x)}}{2 5 ^{c o s (x)}} = 1

Usando el método de sustitución

\frac{62 5 ^{c o s^{2} (x)}}{2 5 ^{c o s (x)}} = 1

Sea:

cos (x) = u

\frac{62 5 ^{u^{2}}}{2 5 ^{u}} = 1

\frac{62 5 ^{u^{2}}}{2 5 ^{u}} = 1 : u = 0, u = \frac{1}{2}

\frac{62 5 ^{u^{2}}}{2 5 ^{u}} = 1

Aplicar las leyes de los exponentes

\frac{62 5 ^{u^{2}}}{2 5 ^{u}} = 1

Aplicar las leyes de los exponentes:

\frac{1}{a ^{b}} = a^{- b}

\frac{1}{2 5 ^{u}} = 2 5^{- u}

62 5^{u^{2}} \cdot 2 5^{- u} = 1

Convertir a base

25 : 2 5^{2 u^{2}} \cdot 2 5^{- u} = 1

Convertir

625

a base

25

625 = 2 5^{2}

(2 5^{2})^{u^{2}} \cdot 2 5^{- u} = 1

Aplicar las leyes de los exponentes:

(a^{b})^{c} = a^{b c}

(2 5^{2})^{u^{2}} = 2 5^{2 u^{2}}

2 5^{2 u^{2}} \cdot 2 5^{- u} = 1

2 5^{2 u^{2}} \cdot 2 5^{- u} = 1

Aplicar las leyes de los exponentes:

a^{b} \cdot a^{c} = a^{b + c}

2 5^{2 u^{2}} \cdot 2 5^{- u} = 2 5^{2 u^{2} - u}

2 5^{2 u^{2} - u} = 1

f (x) = g (x)

, entonces

ln (f (x)) = ln (g (x))

ln (2 5^{2 u^{2} - u}) = ln (1)

Aplicar las propiedades de los logaritmos:

ln (x^{a}) = a \cdot ln (x)

ln (2 5^{2 u^{2} - u}) = (2 u^{2} - u) ln (25)

(2 u^{2} - u) ln (25) = ln (1)

(2 u^{2} - u) ln (25) = ln (1)

Resolver

(2 u^{2} - u) ln (25) = ln (1) : u = 0, u = \frac{1}{2}

(2 u^{2} - u) ln (25) = ln (1)

Factorizar

(2 u^{2} - u) ln (25) : 2 ln (5) u (2 u - 1)

(2 u^{2} - u) ln (25)

Factorizar

2 u^{2} - u : u (2 u - 1)

2 u^{2} - u

Factorizar el termino común

u : u (2 u - 1)

2 u^{2} - u

Aplicar las leyes de los exponentes:

a^{b + c} = a^{b} a^{c}

u^{2} = uu

= 2 uu - u

Factorizar el termino común

u

= u (2 u - 1)

= u (2 u - 1)

= u (2 u - 1) ln (25)

Simplificar

ln (25) : 2 ln (5)

ln (25)

Reescribir

25

utilizando potencias:

25 = 5^{2}

= ln (5^{2})

Aplicar las propiedades de los logaritmos:

lo g_{a} (x^{b}) = b \cdot lo g_{a} (x)

ln (5^{2}) = 2 ln (5)

= 2 ln (5)

= 2 ln (5) u (2 u - 1)

2 ln (5) u (2 u - 1) = ln (1)

Utilizando el teorema de factor cero: si

ab = 0

entonces

a = 0

b = 0

u = 0 or 2 u - 1 = 0

Resolver

2 u - 1 = 0 : u = \frac{1}{2}

2 u - 1 = 0

Mover

1

al lado derecho

2 u - 1 = 0

Sumar

1

a ambos lados

2 u - 1 + 1 = 0 + 1

Simplificar

2 u = 1

2 u = 1

Dividir ambos lados entre

2

2 u = 1

Dividir ambos lados entre

2

\frac{2 u}{2} = \frac{1}{2}

Simplificar

u = \frac{1}{2}

u = \frac{1}{2}

Las soluciones a la ecuación de segundo grado son:

u = 0, u = \frac{1}{2}

u = 0, u = \frac{1}{2}

Verificar las soluciones:

u = 0

Verdadero

, u = \frac{1}{2}

Verdadero

Verificar las soluciones sustituyéndolas en

\frac{62 5 ^{u^{2}}}{2 5 ^{u}} = 1

Quitar las que no concuerden con la ecuación.

Sustituir

u = 0 :

Verdadero

\frac{62 5 ^{0^{2}}}{2 5 ^{0}} = 1

\frac{62 5 ^{0^{2}}}{2 5 ^{0}} = 1

\frac{62 5 ^{0^{2}}}{2 5 ^{0}}

Aplicar la regla

0^{a} = 0

0^{2} = 0

= \frac{62 5 ^{0}}{2 5 ^{0}}

Aplicar la regla

a^{0} = 1, a \neq = 0

2 5^{0} = 1

= \frac{62 5 ^{0}}{1}

Aplicar la regla

a^{0} = 1, a \neq = 0

= \frac{1}{1}

Aplicar la regla

\frac{a}{1} = a

= 1

1 = 1

Verdadero

Sustituir

u = \frac{1}{2} :

Verdadero

\frac{62 5 ^{(\frac{1}{2})^{2}}}{2 5 ^{(\frac{1}{2})}} = 1

\frac{62 5 ^{(\frac{1}{2})^{2}}}{2 5 ^{(\frac{1}{2})}} = 1

\frac{62 5 ^{(\frac{1}{2})^{2}}}{2 5 ^{\frac{1}{2}}}

2 5^{\frac{1}{2}} = 5

2 5^{\frac{1}{2}}

Descomponer el número en factores primos:

25 = 5^{2}

= (5^{2})^{\frac{1}{2}}

Aplicar las leyes de los exponentes:

(a^{b})^{c} = a^{b c}

(5^{2})^{\frac{1}{2}} = 5^{2 \cdot \frac{1}{2}} = 5

= 5

= \frac{62 5 ^{(\frac{1}{2})^{2}}}{5}

62 5^{(\frac{1}{2})^{2}} = 62 5^{\frac{1}{2 ^{2}}}

62 5^{(\frac{1}{2})^{2}}

(\frac{1}{2})^{2} = \frac{1}{2 ^{2}}

(\frac{1}{2})^{2}

Aplicar las leyes de los exponentes:

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

= \frac{1 ^{2}}{2 ^{2}}

Aplicar la regla

1^{a} = 1

1^{2} = 1

= \frac{1}{2 ^{2}}

= 62 5^{\frac{1}{2 ^{2}}}

= \frac{62 5 ^{\frac{1}{2 ^{2}}}}{5}

2^{2} = 4

= \frac{62 5 ^{\frac{1}{4}}}{5}

62 5^{\frac{1}{4}} = 5

62 5^{\frac{1}{4}}

Descomponer el número en factores primos:

625 = 5^{4}

= (5^{4})^{\frac{1}{4}}

Aplicar las leyes de los exponentes:

(a^{b})^{c} = a^{b c}

(5^{4})^{\frac{1}{4}} = 5^{4 \cdot \frac{1}{4}} = 5

= 5

= \frac{5}{5}

Aplicar la regla

\frac{a}{a} = 1

= 1

1 = 1

Verdadero

Las soluciones son

u = 0, u = \frac{1}{2}

Sustituir en la ecuación

u = cos (x)

cos (x) = 0, cos (x) = \frac{1}{2}

cos (x) = 0, cos (x) = \frac{1}{2}

cos (x) = 0 : x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

cos (x) = 0

Soluciones generales para

cos (x) = 0

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} 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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

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

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

cos (x) = \frac{1}{2} : x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

cos (x) = \frac{1}{2}

Soluciones generales para

cos (x) = \frac{1}{2}

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} 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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

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

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

Combinar toda las soluciones

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

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