Daily Math · 2026-05-12

Question 1

The value of $\cos\dfrac{\pi}{4}$ is:

Accepted Answer

$\dfrac{\sqrt{2}}{2}$

Answer

$\dfrac{1}{2}$

Answer

$\dfrac{\sqrt{3}}{2}$

Answer

$1$

Question 2

In $\mathbb{Z}_8$, the additive inverse of $\hat{3}$ is:

Accepted Answer

$\hat{5}$

Answer

$\hat{3}$

Answer

$\hat{0}$

Answer

$\hat{8}$

Question 3

For which value of $a$ does $f(x) = x^3 - 3ax + 1$ have a local minimum at $x = 2$?

Accepted Answer

$a = 4$

Answer

$a = 1$

Answer

$a = 2$

Answer

$a = 3$