If θ1, θ2, θ3, ..., θn are in AP, whose common difference is d, th – InterviewSolution

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1.	If θ1, θ2, θ3, ..., θn are in AP, whose common difference is d, then show thatsecθ1secθ2+secθ2secθ3+...+secθn-1secθn=tanθn-tanθ1sind NCERT EXEMPLAR
Answer» $If θ_{1}, θ_{2}, θ_{3}, . . ., θ_{n} are in AP, whose common difference is d, then show that \sec θ_{1} \sec θ_{2} + \sec θ_{2} \sec θ_{3} + . . . + \sec θ_{n - 1} \sec θ_{n} = \frac{\tan θ_{n} - \tan θ_{1}}{\sin d} [NCERT EXEMPLAR]$

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