$$ f(x)=\cos (4 x-\pi) $$ funksiyaning eng kichik musbat davrini toping. $$ \begin{array}{llll} ext { A) } \frac{\pi}{4} & ext { B) } \frac{\pi}{2} & ext { C) } \frac{3 \pi}{4} & ext { D) } \pi\end{array} $$

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$$ f(x)=\cos (4 x-\pi) $$ funksiyaning eng kichik musbat davrini toping. $$ \begin{array}{llll}	ext { A) } \frac{\pi}{4} & 	ext { B) } \frac{\pi}{2} & 	ext { C) } \frac{3 \pi}{4} & 	ext { D) } \pi\end{array} $$

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Berilgan funksiya:
$$ f(x) = \cos(4x - \pi) $$

Kosinus funksiyaning umumiy shakli:
$$ \cos(kx + c) $$
bu yerda $$ k $$ chastota va $$ c $$ faza burilishi.

Kosinus funksiyaning davri:
$$ T = \frac{2\pi}{|k|} $$

Bu yerda $$ k = 4 $$, shuning uchun:
$$ T = \frac{2\pi}{4} = \frac{\pi}{2} $$

Shunday qilib, berilgan funksiya $$ f(x) = \cos(4x - \pi) $$ ning eng kichik musbat davri $$ \frac{\pi}{2} $$ ga teng.

**Javob:**

**B) $$ \frac{\pi}{2} $$**
Eng kichik musbat davri $$ \frac{\pi}{2} $$.

\( f(x)=\cos (4 x-\pi) \) funksiyaning eng kichik musbat davrini toping. \( \begin{array}{llll}\text { A) } \frac{\pi}{4} & \text { B) } \frac{\pi}{2} & \text { C) } \frac{3 \pi}{4} & \text { D) } \pi\end{array} \)

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