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(sin/sin+1)-(sin/sin-1)=-2tan^2

(sin/sin+1)-(sin/sin-1)=-2tan^2
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Your statement makes no sense.

If you meant
(sinx/sinx+1)-(sinx/sinx-1)=-2tan^2x it would be wrong
it should have said
(sinx/sinx+1)-(sinx/sinx-1) = 2tanx(secx)

to prove that add the two terms on the Left Side, by using a common denominator of (sinx+1)(sinx-1), then simplifiying the left side.
It reduces very nicely to the Right Side.
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