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.

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Question 27 - CBSE Class 10 Sample Paper for 2022 Boards - Maths Basic [MCQ] - Solutions of Sample Papers for Class 10 Boards

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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Davneet Singh

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