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Popular >

verificar sin^2(90-b)+cos^2(b-450)=1

Solución

verificar

sin^{2} (9 0^{\circ} - b) + cos^{2} (b - 45 0^{\circ}) = 1

Solución

Verdadero

Pasos de solución

sin^{2} (9 0^{\circ} - b) + cos^{2} (b - 45 0^{\circ}) = 1

Manipular el lado derecho

sin^{2} (9 0^{\circ} - b) + cos^{2} (b - 45 0^{\circ})

Re-escribir usando identidades trigonométricas

cos (b - 45 0^{\circ})

Utilizar la identidad de diferencia de ángulos:

cos (s - t) = cos (s) cos (t) + sin (s) sin (t)

= cos (b) cos (45 0^{\circ}) + sin (b) sin (45 0^{\circ})

Simplificar

cos (b) cos (45 0^{\circ}) + sin (b) sin (45 0^{\circ}) : sin (b)

cos (b) cos (45 0^{\circ}) + sin (b) sin (45 0^{\circ})

cos (b) cos (45 0^{\circ}) = 0

cos (b) cos (45 0^{\circ})

cos (45 0^{\circ}) = 0

cos (45 0^{\circ})

cos (45 0^{\circ}) = cos (9 0^{\circ})

cos (45 0^{\circ})

Reescribir

45 0^{\circ}

como

36 0^{\circ} + 9 0^{\circ}

= cos (36 0^{\circ} + 9 0^{\circ})

Utilizar la periodicidad de

cos

cos (x + 36 0^{\circ}) = cos (x)

cos (36 0^{\circ} + 9 0^{\circ}) = cos (9 0^{\circ})

= cos (9 0^{\circ})

= cos (9 0^{\circ})

Utilizar la siguiente identidad trivial:

cos (9 0^{\circ}) = 0

cos (9 0^{\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}

= 0

= 0

= 0 \cdot cos (b)

Aplicar la regla

0 \cdot a = 0

= 0

sin (b) sin (45 0^{\circ}) = sin (b)

sin (b) sin (45 0^{\circ})

sin (45 0^{\circ}) = 1

sin (45 0^{\circ})

sin (45 0^{\circ}) = sin (9 0^{\circ})

sin (45 0^{\circ})

Reescribir

45 0^{\circ}

como

36 0^{\circ} + 9 0^{\circ}

= sin (36 0^{\circ} + 9 0^{\circ})

Utilizar la periodicidad de

sin

sin (x + 36 0^{\circ}) = sin (x)

sin (36 0^{\circ} + 9 0^{\circ}) = sin (9 0^{\circ})

= sin (9 0^{\circ})

= sin (9 0^{\circ})

Utilizar la siguiente identidad trivial:

sin (9 0^{\circ}) = 1

sin (9 0^{\circ})

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

= 1

= 1

= 1 \cdot sin (b)

Multiplicar:

sin (b) \cdot 1 = sin (b)

= sin (b)

= 0 + sin (b)

0 + sin (b) = sin (b)

= sin (b)

= sin (b)

= sin^{2} (9 0^{\circ} - b) + (sin (b))^{2}

Re-escribir usando identidades trigonométricas

sin (9 0^{\circ} - b)

Utilizar la identidad de diferencia de ángulos:

sin (s - t) = sin (s) cos (t) - cos (s) sin (t)

= sin (9 0^{\circ}) cos (b) - cos (9 0^{\circ}) sin (b)

Simplificar

sin (9 0^{\circ}) cos (b) - cos (9 0^{\circ}) sin (b) : cos (b)

sin (9 0^{\circ}) cos (b) - cos (9 0^{\circ}) sin (b)

sin (9 0^{\circ}) cos (b) = cos (b)

sin (9 0^{\circ}) cos (b)

Simplificar

sin (9 0^{\circ}) : 1

sin (9 0^{\circ})

Utilizar la siguiente identidad trivial:

sin (9 0^{\circ}) = 1

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

= 1

= 1 \cdot cos (b)

Multiplicar:

1 \cdot cos (b) = cos (b)

= cos (b)

cos (9 0^{\circ}) sin (b) = 0

cos (9 0^{\circ}) sin (b)

Simplificar

cos (9 0^{\circ}) : 0

cos (9 0^{\circ})

Utilizar la siguiente identidad trivial:

cos (9 0^{\circ}) = 0

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}

= 0

= 0 \cdot sin (b)

Aplicar la regla

0 \cdot a = 0

= 0

= cos (b) - 0

cos (b) - 0 = cos (b)

= cos (b)

= cos (b)

= (cos (b))^{2} + (sin (b))^{2}

Quitar los parentesis:

(a) = a

= cos^{2} (b) + sin^{2} (b)

Re-escribir usando identidades trigonométricas

cos^{2} (b) + sin^{2} (b)

Utilizar la identidad pitagórica:

cos^{2} (x) + sin^{2} (x) = 1

= 1

= 1

Se demostró que ambos lados pueden tomar la misma forma

\Rightarrow Verdadero

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