(secA-tanA)^2=1-sinA÷1+sinA
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(1-sinA)/(1+sinA)
=(1-sinA)(1-sinA)/(1+sinA)(1-sinA)
=(1-sinA)^2/(1-sin^2A)
=(1-sinA)^2/cos^2A
={(1-sinA)/cosA}^2
={(1/cosA)-(sinA/cosA)}^2
={secA-tanA}^2..........proved
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