If cos (α + β) = 0, then sin (α – β) can be reduced to
(A) cos β (B) cos 2β (C) sin α (D) sin 2α
NCERT Exemplar - MCQ
Question 2
Question 3
Question 4 Important
Question 5 Important
Question 6 Deleted for CBSE Board 2024 Exams
Question 7 Important
Question 8 Important Deleted for CBSE Board 2024 Exams You are here
Question 9 Deleted for CBSE Board 2024 Exams
Question 10 Important Deleted for CBSE Board 2024 Exams
Question 11
Question 12 Important
Question 13
Question 14 Important Deleted for CBSE Board 2024 Exams
Question 15
Question 16 Important
Question 17 Deleted for CBSE Board 2024 Exams
NCERT Exemplar - MCQ
Last updated at April 16, 2024 by Teachoo
Question 8 If cos (α + β) = 0, then sin (α – β) can be reduced to (A) cos β (B) cos 2β (C) sin α (D) sin 2α Given that cos (α + β) = 0 cos (α + β) = cos 90° Comparing angles α + β = 90° α = 90° − β Now, sin (α – β) = sin (90° − β − β) = sin (90° − 2β) Using cos A = sin (90° − A) = cos 2β So, the correct answer is (B)