prove
(1) (sec A + tan A) (1 - sin A) = cos A
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Step-by-step explanation:
LHS = (1/cosA + sinA/cosA)(1-sinA)
= ((1+sinA)/cosA).(1-sinA)
= (1² - sin²A)/cosA
= sin²A + cos²A -sin²A/cosA
= cos²A/cosA
= cosA
= RHS
hence proved
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