What is the angle in radians equivalent to $22 5^{\circ}$ ?

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What is the cross product $u \times v$ of vectors $u = ⟨ 1, 0, 0 ⟩$ and $v = ⟨ 0, 1, 0 ⟩$ ?
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What is the value of the definite integral $\int_{0}^{π /2} cos (x) d x$ ?
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If a random variable $X$ follows a normal distribution with mean $μ = 50$ and standard deviation $σ = 5$ , what percentage of data fal…
What is the determinant of the $3 \times 3$ identity matrix $I_{3}$ ?