设 和 𝑢 = 1 − 3 𝑖 和 𝑣 = 4 + 𝑖 . 以下哪一种是复数 \（u + uv\） 的笛卡尔形式？单项选择题

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Question text Let \( z_1 = 4+2i \) and \( z_2=-1+3i \). Write \( z_1 z_2 \) in exponential form \( re^{i \theta} \) using the principal argument for \( \theta \). Then \( r^2 = \) Answer 1 Question 3[input]. Writing \( \theta = \frac{p \pi}{q} \), where \(p,q\) are integers and \( \frac{p}{q} \) is a fraction in simplest form, then \( p = \) Answer 2 Question 3[input] and \( q = \) Answer 3 Question 3[input].

Question text When \[ 2 \, \text{cis} \left( - \frac{\pi}{3} \right) \, \text{cis} \left( \frac{\pi}{6} \right) \] is expressed in Cartesian form, it can be written as \( \sqrt{a} - b i \), where \(a\) and \(b\) are integers. Then \( a = \) Answer 1 Question 2[input] and \( b = \) Answer 2 Question 2[input].

Question text Write \[ \frac{i^{17}}{1+i} \] in Cartesian form as \[ \frac{a}{b} + \frac{c}{d} i, \] where \( a,b,c,d \) are integers and \( \frac{a}{b}, \frac{c}{d} \) are fractions in simplest form. Then \( a = \) Answer 1 Question 1[input], \( b = \) Answer 2 Question 1[input], \( c = \) Answer 3 Question 1[input], and \( d = \) Answer 4 Question 1[input].

Let 𝑢 = 1 − 3 𝑖  and  𝑣 = 1 + 𝑖 . Which of the following is the Cartesian form of the complex number 𝑢 + 𝑢 𝑣 ?

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