Trig Question

[RDHDDS]

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Please help!
Solve: 4 csc^2a -1=0 for all values 0≤ a≤ 360^0
A.{1/2, -1/2}
B.{0,1}
C.{-Ö2,Ö2)
D.{-Ö 2/2, Ö 2/2}

 

[RDHDDS]

Let me rewrite the question
Solve: 4csc^2(a) - 1= 0

 

[2007doc]

Let me rewrite the question
Solve: 4csc^2(a) - 1= 0

Answer=(E)who cares

 

[Streetwolf]

Let me rewrite the question
Solve: 4csc^2(a) - 1= 0

4csc^2(a) = 1
csc^2(a) = 1/4
csc(a) = 1/2

1/sin(a) = 1/2

sin(a) = 2

Can't be solved. No solution.

 

[Anemone]

This is a question from topscore and the answer is E which is like empty set or something..so yeah, no solution.