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(c) π/2 Students who can Practice CBSE Class 12 Maths Multiple Choice Questions with Answers to improve your score in Board Exams. (d) None of these, Answer: (b) 1 For Study plan details. = cos² x + cos² y – 2cos² x × cos² y + 2cos x × cos y × sin x × sin y Hint: = (sin 60 – sin 20 + sin 20)/(-cos 20 + cos 60 + cos 20) ⇒ 2 cos((A + C)/2) × cos((A-C)/2 = 4 sin²(B/2) Hence, its opposite angles are equal; so ∠P = ∠QSP = 120°, Question 17. = 1 + √2 ( sin 65 – √2 sin 65 Academic Partner. Practicing given Class 11 Maths Chapter wise Important Questions with solutions will help in scoring more marks in your Examinations. Also, learn Kindly give Chapter 3 Matrices Class 12 Maths MCQs Questions with Answers quickly as it is very essential. 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