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Use the fundamental identities to simplify :9/tanx2+1

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9 /(tanX^2 +1 ) = 9/ ( Sin^2 X / Cos^2 X  +1 ) = 9 / ( Sin^2 X + Cos^2X / COS^2 X  ) =
 
                                                                      = 9 / ( 1 / Cos^2 X ) = 9 Cos^2 X