If x = 2sin 2 𝜃  and y = 2 cos 2 𝜃  + 1 then x + y is

(a) 3   (b) 2   (c) 1   (d)1/2

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Question 27 If x = 2sin2𝜃 and y = 2 cos2𝜃 + 1 then x + y is (a) 3 (b) 2 (c) 1 (d)1/2 Now, x + y = 2sin2 𝜃 + (2 cos2 𝜃 + 1) = (2sin2 𝜃 + 2cos2 𝜃) + 1 = 2(sin2 𝜃 + cos2 𝜃) + 1 Putting sin2 𝜃 + cos2 𝜃 = 1 = 2 × 1 + 1 = 2 + 1 = 3 So, the correct answer is (a)

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.