seca-tana+1/seca+tana+1=1-sina/cosa
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Step-by-step explanation:
seca-tana +sec^2a- tan^2a/seca+tana
seca-tana +seca-tana +seca +tana/seca+tana
2seca-2tana
2(1/cosa-sina/cosa)
1-sina/cos (hence proved)
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