Ex 5.2, 8 - Convert in polar form: i - Chapter 5 Class 11 - Polar representation

Ex 5.2, 8 - Chapter 5 Class 11 Complex Numbers - Part 2
Ex 5.2, 8 - Chapter 5 Class 11 Complex Numbers - Part 3
Ex 5.2, 8 - Chapter 5 Class 11 Complex Numbers - Part 4

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Question 8: Convert the given complex number in polar form: 𝑖 z = 𝑖 z = 0 + 𝑖 Let polar form be z = r (cos⁡θ + i sin⁡θ) From (1) & (2) 0 + i = r ( cos⁡θ + i sin⁡θ) 0 + 𝑖 = r〖 cos〗⁡θ + 𝑖 r sin⁡θ Adding (3) and (4) 0 + 1 = r2 cos2 θ + r2 sin2 θ 1=𝑟2 (cos2 θ+sin2 θ) 1 = r2 (1) 1 = r2 1 = r r = 1 Finding argument 0 + 𝑖 = r cos θ + 𝑖r sin θ Comparing real part 0 = r cos θ Put r = 1 0 = 1 × cos θ 0 = cos θ cos θ = 0 Hence, cos θ = 0 & sin θ = 1 Hence, cos θ = 0 & sin θ = 1 Since, sin θ is positive and cos θ is zero Hence, θ lies in Ist quadrant So, Argument = 90° = 90 × 𝜋/180 = 𝜋/2 Hence r = 1 and θ = 𝜋/2 Polar form of z = r (cos θ + sin θ) = 1 ( cos 𝜋/2 + i sin 𝜋/2 )

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo