(secA+tana) (1- sinA) =
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(secA+tana) (1- sinA)
[ 1/Cos A + sin A/cos A] (1-sin A)
[ 1+sin A/ cos A] (1-sin A)
1-sin²A/cosA = Cos²A/cos A
= Cos A is correct answer.
hope it helpful to you
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