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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+𝑥sec⁡𝑥(f∘g∘f −1 )(x)=x 2 +xsecxB.(𝑔∘ℎ∘𝑓−1)(𝑥)=16+4sec⁡4(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+4𝑥sec⁡𝑥(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+𝑥sec⁡𝑥(f∘g∘f −1 )(x)=x 2 +xsecxB.(𝑔∘ℎ∘𝑓−1)(𝑥)=16+4sec⁡4(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+4𝑥sec⁡𝑥(h∙(f −1 ∘f −1 ∘f∘f∘g))(x)=4x 2 +4xsecxSUBMITarrow_backPREVIOUS

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Solution

Para resolver esta pregunta, vamos a analizar cada una de las opciones dadas:

A. (fgf1)(x)=x2+xsecx(f \circ g \circ f^{-1})(x) = x^2 + x \sec x

Dado que ff es una función uno a uno y f1f^{-1} es su inversa, sabemos que f(f1(x))=xf(f^{-1}(x)) = x. Por lo tanto, (fgf1)(x)=g(x)(f \circ g \circ f^{-1})(x) = g(x). Como g(x)=x2+xsecxg(x) = x^2 + x \sec x, esta opción es verdadera.

B. (ghf1)(x)=16+4sec4(g \circ h \circ f^{-1})(x) = 16 + 4 \sec 4

Sabemos que h(x)=4h(x) = 4. Entonces, h(f1(x))=4h(f^{-1}(x)) = 4. Por lo tanto, (ghf1)(x)=g(4)(g \circ h \circ f^{-1})(x) = g(4). Calculamos g(4)g(4):

g(4)=42+4sec4=16+4sec4 g(4) = 4^2 + 4 \sec 4 = 16 + 4 \sec 4

Esta opción también es verdadera.

C. (ff1h)(x)=4(f \circ f^{-1} \circ h)(x) = 4

Sabemos que h(x)=4h(x) = 4. Entonces, h(x)=4h(x) = 4 para cualquier xx. Por lo tanto, (ff1h)(x)=f(f1(4))=4(f \circ f^{-1} \circ h)(x) = f(f^{-1}(4)) = 4. Esta opción es verdadera.

D. (hgg)(x)=4(h \circ g \circ g)(x) = 4

Sabemos que h(x)=4h(x) = 4. Entonces, hh es constante y siempre devuelve 4, sin importar el valor de entrada. Por lo tanto, (hgg)(x)=h(g(g(x)))=4(h \circ g \circ g)(x) = h(g(g(x))) = 4. Esta opción es verdadera.

E. (h(f1f1ffg))(x)=4x2+4xsecx(h \cdot (f^{-1} \circ f^{-1} \circ f \circ f \circ g))(x) = 4x^2 + 4x \sec x

Sabemos que ff y f1f^{-1} son funciones inversas, por lo que f(f1(x))=xf(f^{-1}(x)) = x. Entonces, (f1f1ffg)(x)=g(x)(f^{-1} \circ f^{-1} \circ f \circ f \circ g)(x) = g(x). Por lo tanto, (h(f1f1ffg))(x)=h(x)g(x)(h \cdot (f^{-1} \circ f^{-1} \circ f \circ f \circ g))(x) = h(x) \cdot g(x). Dado que h(x)=4h(x) = 4, tenemos:

(h(f1f1ffg))(x)=4g(x)=4(x2+xsecx)=4x2+4xsecx (h \cdot (f^{-1} \circ f^{-1} \circ f \circ f \circ g))(x) = 4 \cdot g(x) = 4(x^2 + x \sec x) = 4x^2 + 4x \sec x

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.

This problem has been solved

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