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Popular >

sin^2(x)-2cos^2(x)+cos^2(x)=0

Solución

sin^{2} (x) - 2 cos^{2} (x) + cos^{2} (x) = 0

Solución

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

Grados

x = 13 5^{\circ} + 18 0^{\circ} n, x = 4 5^{\circ} + 18 0^{\circ} n

Pasos de solución

sin^{2} (x) - 2 cos^{2} (x) + cos^{2} (x) = 0

Factorizar

sin^{2} (x) - 2 cos^{2} (x) + cos^{2} (x) : (sin (x) + cos (x)) (sin (x) - cos (x))

sin^{2} (x) - 2 cos^{2} (x) + cos^{2} (x)

Sumar elementos similares:

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

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

Aplicar la siguiente regla para binomios al cuadrado:

x^{2} - y^{2} = (x + y) (x - y)

sin^{2} (x) - cos^{2} (x) = (sin (x) + cos (x)) (sin (x) - cos (x))

= (sin (x) + cos (x)) (sin (x) - cos (x))

(sin (x) + cos (x)) (sin (x) - cos (x)) = 0

Resolver cada parte por separado

sin (x) + cos (x) = 0 or sin (x) - cos (x) = 0

sin (x) + cos (x) = 0 : x = \frac{3 π}{4} + πn

sin (x) + cos (x) = 0

Re-escribir usando identidades trigonométricas

sin (x) + cos (x) = 0

Dividir ambos lados entre

cos (x), cos (x) \neq = 0

\frac{sin ( x ) + cos ( x )}{cos ( x )} = \frac{0}{cos ( x )}

Simplificar

\frac{sin ( x )}{cos ( x )} + 1 = 0

Utilizar la identidad trigonométrica básica:

\frac{sin ( x )}{cos ( x )} = tan (x)

tan (x) + 1 = 0

tan (x) + 1 = 0

Mover

1

al lado derecho

tan (x) + 1 = 0

Restar

1

de ambos lados

tan (x) + 1 - 1 = 0 - 1

Simplificar

tan (x) = - 1

tan (x) = - 1

Soluciones generales para

tan (x) = - 1

tan (x)

tabla de valores periódicos con

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = \frac{3 π}{4} + πn

x = \frac{3 π}{4} + πn

sin (x) - cos (x) = 0 : x = \frac{π}{4} + πn

sin (x) - cos (x) = 0

Re-escribir usando identidades trigonométricas

sin (x) - cos (x) = 0

Dividir ambos lados entre

cos (x), cos (x) \neq = 0

\frac{sin ( x ) - cos ( x )}{cos ( x )} = \frac{0}{cos ( x )}

Simplificar

\frac{sin ( x )}{cos ( x )} - 1 = 0

Utilizar la identidad trigonométrica básica:

\frac{sin ( x )}{cos ( x )} = tan (x)

tan (x) - 1 = 0

tan (x) - 1 = 0

Mover

1

al lado derecho

tan (x) - 1 = 0

Sumar

1

a ambos lados

tan (x) - 1 + 1 = 0 + 1

Simplificar

tan (x) = 1

tan (x) = 1

Soluciones generales para

tan (x) = 1

tan (x)

tabla de valores periódicos con

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

Combinar toda las soluciones

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

Ejemplos populares

sqrt(3)*sin(x)=cos(x)

3 \cdot sin (x) = cos (x)

sin^{22}(x)sin^3(x)+6=18

sin^{22} (x) sin^{3} (x) + 6 = 18

d^2+4d+4=sin(x)

d^{2} + 4 d + 4 = sin (x)

8cos(a)-15sin(a)=0

8 cos (a) - 15 sin (a) = 0

tan(t)= 3/(tan(t))

tan (t) = \frac{3}{tan ( t )}