Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
30.5k views
in Trigonometry by (53.1k points)

The equation ksinx + cos2x = 2k - 7 possesses a solution if

(A)  k > 6

(B)  2≤ k ≤ 6

(C)  k > 2

(D)  None of these

1 Answer

+1 vote
by (53.3k points)
selected by
 
Best answer

Correct option  (B)  2 ≤k ≤6

We have

But sin ≠ 2. Therefore, sin x = 1/2(k - 4). Now

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

...