Other Exam Numerical Ability

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

Read Solution (Total 1)

ans: cosA

secA=1/cosA,tanA=sinA/cosA,
(sec A+tan A)(1-sin A)
=(1/cosA+sinA/cosA)(1-sinA)
=(1+sinA)(1-sinA)/cosA
=(1-sin2A)/cosA
=cos2A/cosA
=cosA
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