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(sec A+tan A)(1-sin A)=?

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(sec A+tan A)(1-sin A)=?
A. sinA
B. cosA
C. secA
D. cosecA
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Correct Answer - B
`(secA+tanA)(1-sinA)=((1)/(cosA)+(sinA)/(cosA))(1-sinA)=((1+sinA)(1-sinA))/(cosA)=(1-sin^(2)A)/(cosA)=(cos^(2)A)/(cosA)=cosA.`
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