prove that
sec A(1+sin A)(sec A-tan A)=1
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L.H.S
secA (1+sinA) (secA - tanA )
1/cos (1+sinA) (1/cosA -sinA/cosA)
(1+sinA/cosA) (1-sinA/cosA)
1^2-sinA^2/cos^2A
cos^2A/cos^2A=1
L.H.S=R.H.S proved I hope your answer
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