Suppose that f is a one-to-one function, and f - 1 is its inverse. Suppose also that h(x) = 4 and g(x) = 𝑥2x 2 + xsecx. Then which of the following do we NOT know to be true?A.(𝑓∘𝑔∘𝑓−1)(𝑥)=𝑥2+𝑥sec𝑥(f∘g∘f −1 )(x)=x 2 +xsecxB.(𝑔∘ℎ∘𝑓−1)(𝑥)=16+4sec4(g∘h∘f −1 )(x)=16+4sec4C.(𝑓∘𝑓−1∘ℎ)(𝑥)=4(f∘f −1 ∘h)(x)=4D.(ℎ∘𝑔∘𝑔)(𝑥)=4(h∘g∘g)(x)=4E.(ℎ∙(𝑓−1∘𝑓−1∘𝑓∘𝑓∘𝑔))(𝑥)=4𝑥2+4𝑥sec𝑥(h∙(f −1 ∘f −1 ∘f∘f∘g))(x)=4x 2 +4xsecxSUBMITarrow_backPREVIOUS
Question
Suppose that f is a one-to-one function, and f - 1 is its inverse. Suppose also that h(x) = 4 and g(x) = 𝑥2x 2 + xsecx. Then which of the following do we NOT know to be true?A.(𝑓∘𝑔∘𝑓−1)(𝑥)=𝑥2+𝑥sec𝑥(f∘g∘f −1 )(x)=x 2 +xsecxB.(𝑔∘ℎ∘𝑓−1)(𝑥)=16+4sec4(g∘h∘f −1 )(x)=16+4sec4C.(𝑓∘𝑓−1∘ℎ)(𝑥)=4(f∘f −1 ∘h)(x)=4D.(ℎ∘𝑔∘𝑔)(𝑥)=4(h∘g∘g)(x)=4E.(ℎ∙(𝑓−1∘𝑓−1∘𝑓∘𝑓∘𝑔))(𝑥)=4𝑥2+4𝑥sec𝑥(h∙(f −1 ∘f −1 ∘f∘f∘g))(x)=4x 2 +4xsecxSUBMITarrow_backPREVIOUS
Solution
Para resolver esta pregunta, vamos a analizar cada una de las opciones dadas:
A.
Dado que es una función uno a uno y es su inversa, sabemos que . Por lo tanto, . Como , esta opción es verdadera.
B.
Sabemos que . Entonces, . Por lo tanto, . Calculamos :
Esta opción también es verdadera.
C.
Sabemos que . Entonces, para cualquier . Por lo tanto, . Esta opción es verdadera.
D.
Sabemos que . Entonces, es constante y siempre devuelve 4, sin importar el valor de entrada. Por lo tanto, . Esta opción es verdadera.
E.
Sabemos que y son funciones inversas, por lo que . Entonces, . Por lo tanto, . Dado que , tenemos:
Esta opción también es verdadera.
Por lo tanto, todas las opciones A, B, C, D y E son verdaderas. No hay ninguna opción que no sepamos que sea verdadera.
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