SOLUTION: I have to complete this identity: (sin Ø) / (1 + sin Ø)- (sin Ø) / (1 - sin Ø)=?

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Question 1035761: I have to complete this identity: (sin Ø) / (1 + sin Ø)- (sin Ø) / (1 - sin Ø)=?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!

Combining fractions we get
=
-2%28sin%28phi%29%29%5E2%2F%28cos%28phi%29%29%5E2=
-2%28tan%28phi%29%29%5E2