secA(1-sinA)(secA+tanA)=1
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SecA=1/cosA
TanA=sinA/cosA
So
(1-sinA/cosA)(1+sinA/cosA)
1^2-sinA^2/cos^2A
Cos^2A/cos^2A
1
Hence proved
TanA=sinA/cosA
So
(1-sinA/cosA)(1+sinA/cosA)
1^2-sinA^2/cos^2A
Cos^2A/cos^2A
1
Hence proved
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