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answer will be 1.
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Step-by-step explanation:
let x = Theeta
1/secx -tanx - 1/Cosx
rationalize by secx+tanx
you will get
secx +tanx -secx
1/Cosx + tanx -secx
again rationalize by tanx +secx
and note tan²x-sec²x = -1
1/Cosx - 1/ (secx +tanx )
hence proved
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