√1-sinA/1+sinA= secA- tanA
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√(1-sinA)/√(1+sinA) × √(1-sinA)/√(1-sinA)
√(1-sinA)^2 / √(1-sin^2A)
(1-sinA) / √(cos^2A)
(1-sinA) / cosA
1/cosA - sinA/cosA
secA-tanA. ....Hp
.... hope it's helpful
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