SOLUTION: prove the following 1)-csc^2(x)= 2/(cos2(x)-1) 2)cos2(x)=(1-tan^2(x))/(1+tan^2(x)) 3)sin2(x)-2cot(x)sin^2(x)=0

Question 1165389: prove the following

1)-csc^2(x)= 2/(cos2(x)-1)
2)cos2(x)=(1-tan^2(x))/(1+tan^2(x))
3)sin2(x)-2cot(x)sin^2(x)=0

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
1)-csc^2(x)= 2/(cos2(x)-1)
2)cos2(x)=(1-tan^2(x))/(1+tan^2(x))
3)sin2(x)-2cot(x)sin^2(x)=0
=================
Not clear.
1)-csc^2(x)= 2/(cos2(x)-1)
Is it -csc^2(x)= 2/(cos(2x)-1) ?
Or -csc^2(x)= 2/(cos^2(x)-1) ?
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