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FUNCIONES
TRIGONOMETRICAS
Las funciones trigonométricas se definen comúnmente como el cociente entre dos lados
de un triangulo rectángulo, asociado a sus ángulos. Existen seis funciones trigonométricas
básicas:
¿Que son?
𝑆𝑒𝑛 𝛼 =
𝐶𝑜
ℎ
𝐶𝑜𝑠 𝛼 =
𝐶𝑎
ℎ
Tan 𝛼 =
𝐶𝑜
𝐶𝑎
𝐶𝑠𝑐 𝛼 =
ℎ
𝐶𝑜
𝑆𝑒𝑐 𝛼 =
ℎ
𝐶𝑎
𝐶𝑜𝑡 𝛼 =
𝐶𝑎
𝐶𝑜
LEY DEL COSENO
Permite encontrar el valor de uno de los lados de un triángulo conociendo de
antemano el ángulo opuesto a dicho lado y los valores de los otros dos lados.
𝑐2 = 𝑎2 + 𝑏2 − 2𝑎 ∙ 𝑏 ∙ cos 𝛼
𝑎2 = 𝑏2 + 𝑐2 − 2𝑏 ∙ 𝑐 ∙ cos 𝛽
𝑏2 = 𝑎2 + 𝑐2 − 2𝑎 ∙ 𝑐 ∙ cos 𝜙
LEY DEL SENO
La Ley del Seno relaciona 3 igualdades que siempre se cumplen entre los lados y
ángulos de un triángulo cualquiera.
𝑎
𝑠𝑒𝑛 𝛽
=
𝑐
𝑠𝑒𝑛 𝛼
=
𝑏
𝑠𝑒𝑛 𝜙
IDENTIDADES TRIGONOMETRICAS
Las identidades trigonométricas son ecuaciones que involucran las funciones
trigonométricas que son verdaderas para cada valor de las variables involucradas.
Entre las identidades trigonométricas encontramos las siguientes:
𝑰𝒅𝒆𝒏𝒕𝒊𝒅𝒂𝒅𝒆𝒔 𝒓𝒆𝒄𝒊𝒑𝒓𝒐𝒄𝒂𝒔
csc 𝑥 =
1
sen 𝑥
⟹ csc 𝑥 ∙ sen 𝑥 = 1
sec 𝑥 =
1
cos 𝑥
⟹ sec 𝑥 ∙ cos 𝑥 = 1
c𝑜𝑡 𝑥 =
1
tan 𝑥
⟹ c𝑜𝑡 𝑥 ∙ tan 𝑥 = 1
⟸ sen 𝑥 =
1
csc 𝑥
⟸ se𝑐 𝑥 =
1
c𝑜𝑠 𝑥
⟸ tan 𝑥 =
1
c𝑜𝑡 𝑥
𝑰𝒅𝒆𝒏𝒕𝒊𝒅𝒂𝒅𝒆𝒔 𝒄𝒐𝒄𝒊𝒆𝒏𝒕𝒆
sen 𝑥 =
𝑐𝑜
ℎ cos 𝑥 =
𝑐𝑎
ℎ
𝑐𝑜 = ℎ ∙ sen 𝑥 𝑐𝑎 = ℎ ∙ cos 𝑥
cot 𝑥 =
𝑐𝑎
𝑐𝑜
tan 𝑥 =
𝑐𝑜
𝑐𝑎
tan 𝑥 =
ℎ ∙ sen 𝑥
ℎ ∙ cos 𝑥 cot 𝑥 =
ℎ ∙ cos 𝑥
ℎ ∙ sen 𝑥
tan 𝑥 =
sen 𝑥
cos 𝑥
cot 𝑥 =
cos 𝑥
sen 𝑥
𝑰𝒅𝒆𝒏𝒕𝒊𝒅𝒂𝒅𝒆𝒔 𝒑𝒊𝒕𝒂𝒈𝒐𝒓𝒊𝒄𝒂𝒔
1 = 𝑠𝑒𝑛2
𝑥 + 𝑐𝑜𝑠2
𝑥
𝑐𝑠𝑐2
𝑥 = 1 + 𝑐𝑜𝑡2
𝑥
𝑠𝑒𝑐2
𝑥 = 𝑡𝑎𝑛2
𝑥 + 1

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Funciones Trigonometricas

  • 2. Las funciones trigonométricas se definen comúnmente como el cociente entre dos lados de un triangulo rectángulo, asociado a sus ángulos. Existen seis funciones trigonométricas básicas: ¿Que son? 𝑆𝑒𝑛 𝛼 = 𝐶𝑜 ℎ 𝐶𝑜𝑠 𝛼 = 𝐶𝑎 ℎ Tan 𝛼 = 𝐶𝑜 𝐶𝑎 𝐶𝑠𝑐 𝛼 = ℎ 𝐶𝑜 𝑆𝑒𝑐 𝛼 = ℎ 𝐶𝑎 𝐶𝑜𝑡 𝛼 = 𝐶𝑎 𝐶𝑜
  • 3. LEY DEL COSENO Permite encontrar el valor de uno de los lados de un triángulo conociendo de antemano el ángulo opuesto a dicho lado y los valores de los otros dos lados. 𝑐2 = 𝑎2 + 𝑏2 − 2𝑎 ∙ 𝑏 ∙ cos 𝛼 𝑎2 = 𝑏2 + 𝑐2 − 2𝑏 ∙ 𝑐 ∙ cos 𝛽 𝑏2 = 𝑎2 + 𝑐2 − 2𝑎 ∙ 𝑐 ∙ cos 𝜙
  • 4. LEY DEL SENO La Ley del Seno relaciona 3 igualdades que siempre se cumplen entre los lados y ángulos de un triángulo cualquiera. 𝑎 𝑠𝑒𝑛 𝛽 = 𝑐 𝑠𝑒𝑛 𝛼 = 𝑏 𝑠𝑒𝑛 𝜙
  • 5. IDENTIDADES TRIGONOMETRICAS Las identidades trigonométricas son ecuaciones que involucran las funciones trigonométricas que son verdaderas para cada valor de las variables involucradas. Entre las identidades trigonométricas encontramos las siguientes: 𝑰𝒅𝒆𝒏𝒕𝒊𝒅𝒂𝒅𝒆𝒔 𝒓𝒆𝒄𝒊𝒑𝒓𝒐𝒄𝒂𝒔 csc 𝑥 = 1 sen 𝑥 ⟹ csc 𝑥 ∙ sen 𝑥 = 1 sec 𝑥 = 1 cos 𝑥 ⟹ sec 𝑥 ∙ cos 𝑥 = 1 c𝑜𝑡 𝑥 = 1 tan 𝑥 ⟹ c𝑜𝑡 𝑥 ∙ tan 𝑥 = 1 ⟸ sen 𝑥 = 1 csc 𝑥 ⟸ se𝑐 𝑥 = 1 c𝑜𝑠 𝑥 ⟸ tan 𝑥 = 1 c𝑜𝑡 𝑥
  • 6. 𝑰𝒅𝒆𝒏𝒕𝒊𝒅𝒂𝒅𝒆𝒔 𝒄𝒐𝒄𝒊𝒆𝒏𝒕𝒆 sen 𝑥 = 𝑐𝑜 ℎ cos 𝑥 = 𝑐𝑎 ℎ 𝑐𝑜 = ℎ ∙ sen 𝑥 𝑐𝑎 = ℎ ∙ cos 𝑥 cot 𝑥 = 𝑐𝑎 𝑐𝑜 tan 𝑥 = 𝑐𝑜 𝑐𝑎 tan 𝑥 = ℎ ∙ sen 𝑥 ℎ ∙ cos 𝑥 cot 𝑥 = ℎ ∙ cos 𝑥 ℎ ∙ sen 𝑥 tan 𝑥 = sen 𝑥 cos 𝑥 cot 𝑥 = cos 𝑥 sen 𝑥 𝑰𝒅𝒆𝒏𝒕𝒊𝒅𝒂𝒅𝒆𝒔 𝒑𝒊𝒕𝒂𝒈𝒐𝒓𝒊𝒄𝒂𝒔 1 = 𝑠𝑒𝑛2 𝑥 + 𝑐𝑜𝑠2 𝑥 𝑐𝑠𝑐2 𝑥 = 1 + 𝑐𝑜𝑡2 𝑥 𝑠𝑒𝑐2 𝑥 = 𝑡𝑎𝑛2 𝑥 + 1