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Popular >

2cos^2(x)=1-cos^2(x)

Solución

2 cos^{2} (x) = 1 - cos^{2} (x)

Solución

x = 0.95531 \dots + 2 πn, x = 2 π - 0.95531 \dots + 2 πn, x = 2.18627 \dots + 2 πn, x = - 2.18627 \dots + 2 πn

+1

Grados

x = 54.73561 \dots^{\circ} + 36 0^{\circ} n, x = 305.26438 \dots^{\circ} + 36 0^{\circ} n, x = 125.26438 \dots^{\circ} + 36 0^{\circ} n, x = - 125.26438 \dots^{\circ} + 36 0^{\circ} n

Pasos de solución

2 cos^{2} (x) = 1 - cos^{2} (x)

Usando el método de sustitución

2 cos^{2} (x) = 1 - cos^{2} (x)

Sea:

cos (x) = u

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

2 u^{2} = 1 - u^{2} : u = \frac{1}{3}, u = - \frac{1}{3}

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

Mover

u^{2}

al lado izquierdo

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

Sumar

u^{2}

a ambos lados

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

Simplificar

3 u^{2} = 1

3 u^{2} = 1

Dividir ambos lados entre

3

3 u^{2} = 1

Dividir ambos lados entre

3

\frac{3 u ^{2}}{3} = \frac{1}{3}

Simplificar

u^{2} = \frac{1}{3}

u^{2} = \frac{1}{3}

Para

x^{2} = f (a)

las soluciones son

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

u = \frac{1}{3}, u = - \frac{1}{3}

Sustituir en la ecuación

u = cos (x)

cos (x) = \frac{1}{3}, cos (x) = - \frac{1}{3}

cos (x) = \frac{1}{3}, cos (x) = - \frac{1}{3}

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

cos (x) = \frac{1}{3}

Aplicar propiedades trigonométricas inversas

cos (x) = \frac{1}{3}

Soluciones generales para

cos (x) = \frac{1}{3}

cos (x) = a \Rightarrow x = arccos (a) + 2 πn, x = 2 π - arccos (a) + 2 πn

x = arccos (\frac{1}{3}) + 2 πn, x = 2 π - arccos (\frac{1}{3}) + 2 πn

x = arccos (\frac{1}{3}) + 2 πn, x = 2 π - arccos (\frac{1}{3}) + 2 πn

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

cos (x) = - \frac{1}{3}

Aplicar propiedades trigonométricas inversas

cos (x) = - \frac{1}{3}

Soluciones generales para

cos (x) = - \frac{1}{3}

cos (x) = - a \Rightarrow x = arccos (- a) + 2 πn, x = - arccos (- a) + 2 πn

x = arccos (- \frac{1}{3}) + 2 πn, x = - arccos (- \frac{1}{3}) + 2 πn

x = arccos (- \frac{1}{3}) + 2 πn, x = - arccos (- \frac{1}{3}) + 2 πn

Combinar toda las soluciones

x = arccos (\frac{1}{3}) + 2 πn, x = 2 π - arccos (\frac{1}{3}) + 2 πn, x = arccos (- \frac{1}{3}) + 2 πn, x = - arccos (- \frac{1}{3}) + 2 πn

Mostrar soluciones en forma decimal

x = 0.95531 \dots + 2 πn, x = 2 π - 0.95531 \dots + 2 πn, x = 2.18627 \dots + 2 πn, x = - 2.18627 \dots + 2 πn

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sin(x/2)=1-cos(x)

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