Consider the following functions:𝑓(𝑥)=cos(𝑥3−𝑥)ℎ(𝑥)=∣𝑥−3∣3𝑔(𝑥)=ln(∣𝑥∣+3)𝑠(𝑥)=sin3(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)=sin3(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.
Solution
Para determinar si las funciones son pares o impares, debemos recordar las definiciones:
- Una función es par si .
- Una función es impar si .
Analicemos cada función:
-
- La función coseno es par, por lo que
- Entonces, , por lo que es par.
-
- Claramente, y
- Entonces, no es ni par ni impar.
-
- Entonces, , por lo que es par.
-
- Entonces, , por lo que es impar.
Con esta información, la opción correcta es:
C. y son pares, es impar.
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