Cos A/1+ sin A+ tan A= sec A
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Step-by-step explanation:
cosA/1+sinA +tanA
=cosA/1+sinA +sinA/cosA
=cos²A+sinA(1+sinA)/(1+sinA)cosA
=cos²A+sinA+sin²A/(1+sinA)cosA
=1+sinA/(1+sinA)cosA
=1/cosA
=secA
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