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Consider the following functions:𝑓(𝑥)=cos⁡(𝑥3−𝑥)ℎ(𝑥)=∣𝑥−3∣3𝑔(𝑥)=ln⁡(∣𝑥∣+3)𝑠(𝑥)=sin⁡3(𝑥)​ f(x)=cos(x 3 −x)h(x)=∣x−3∣ 3 g(x)=ln(∣x∣+3)s(x)=sin 3 (x)​ Which of the following is true?A. f is even, h and s are odd.B.h and s are odd, g is even.C. f and g are even, s is odd.D.g and f are even, h is odd.E.s is odd, f and h are even.

Question

Consider the following functions:𝑓(𝑥)=cos⁡(𝑥3−𝑥)ℎ(𝑥)=∣𝑥−3∣3𝑔(𝑥)=ln⁡(∣𝑥∣+3)𝑠(𝑥)=sin⁡3(𝑥)​ f(x)=cos(x 3 −x)h(x)=∣x−3∣ 3 g(x)=ln(∣x∣+3)s(x)=sin 3 (x)​ Which of the following is true?A. f is even, h and s are odd.B.h and s are odd, g is even.C. f and g are even, s is odd.D.g and f are even, h is odd.E.s is odd, f and h are even.

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Solution

Para determinar si las funciones son pares o impares, debemos recordar las definiciones:

  • Una función f(x) f(x) es par si f(x)=f(x) f(-x) = f(x) .
  • Una función f(x) f(x) es impar si f(x)=f(x) f(-x) = -f(x) .

Analicemos cada función:

  1. f(x)=cos(x3x) f(x) = \cos(x^3 - x)

    • f(x)=cos((x)3(x))=cos(x3+x) f(-x) = \cos((-x)^3 - (-x)) = \cos(-x^3 + x)
    • La función coseno es par, por lo que cos(x3+x)=cos(x3x) \cos(-x^3 + x) = \cos(x^3 - x)
    • Entonces, f(x)=f(x) f(-x) = f(x) , por lo que f(x) f(x) es par.
  2. h(x)=x33 h(x) = |x - 3|^3

    • h(x)=x33=(x+3)3=x+33 h(-x) = |-x - 3|^3 = |-(x + 3)|^3 = |x + 3|^3
    • Claramente, h(x)h(x) h(-x) \neq h(x) y h(x)h(x) h(-x) \neq -h(x)
    • Entonces, h(x) h(x) no es ni par ni impar.
  3. g(x)=ln(x+3) g(x) = \ln(|x| + 3)

    • g(x)=ln(x+3)=ln(x+3) g(-x) = \ln(|-x| + 3) = \ln(|x| + 3)
    • Entonces, g(x)=g(x) g(-x) = g(x) , por lo que g(x) g(x) es par.
  4. s(x)=sin3(x) s(x) = \sin^3(x)

    • s(x)=sin3(x)=(sin(x))3=(sin(x))3=sin3(x) s(-x) = \sin^3(-x) = (\sin(-x))^3 = (-\sin(x))^3 = -\sin^3(x)
    • Entonces, s(x)=s(x) s(-x) = -s(x) , por lo que s(x) s(x) es impar.

Con esta información, la opción correcta es:

C. g g y f f son pares, s s es impar.

This problem has been solved

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