Q38 / 90 · JEE Main 2024 (30 Jan Shift 2) · Mathematics

For α,β∈0,π2 let 3sin(α+β)=2sin(α-β) and a real number k be such that tanα= tanβ. Then the value of k is equal to

  • Correct answer
    A
    -5
  • B
    5
  • C
    23
  • D
    -23

Solution

Given:

 3sinα+β=2sinα-β

⇒sinα+βsinα-β=23

⇒sinα+β+sinα-βsinα+β-sinα-β=2+32-3

⇒2sinαcosβ2cosαsinβ=-5

⇒tanαtanβ=-5

⇒tanα=-5tanβ

⇒k=-5

Hence, the correct answer is option: 'A'.

Relevant Questions