secA+tanA=cosA÷1-sinA
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SecA + tanA = 1/cosA + sinA/cosA
= (1+sinA)/cosA
= (1+sinA)(1-sinA)/cosA(1-sinA)
= (1-sin^2 A)/cosA(1-sinA)
= Cos^2 A/cosA(1-sinA)
= cosA/1-sinA
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