If - sin θ + cosec θ = 6, then what is the value of sinθ + cosec θ ?
Answer & explanation
Correct answer: option 2
We are given that :-
- sin θ + cosec θ = 6
- sin θ + \(\frac{1}{sinθ}\)= 6
- sin² θ + 1 = 6 sin θ
sin² θ + 6 sin θ - 1 = 0
By solving the quadratic equation . we find that ,
sin θ = ( -3 ± √10 )
Now,
sin θ + cosec θ
= sin θ + ( 6 + sin θ )
= 2 sin θ + 6
= 2 ( -3 ± √10 ) + 6
= 2± √10
= √40