secA+tanA=cosA÷1-sinA
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1/cosA(SinA+1)
1/cosA(1-sin^2A)/1-sinA
1/cosA(cos^2A)/1-SinA
cosA/1-SinA......
1/cosA(1-sin^2A)/1-sinA
1/cosA(cos^2A)/1-SinA
cosA/1-SinA......
liza098765432:
wrong
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