Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If tan2 θ = 1 - a2, then the value of sec θ + tan3 θ cosec θ is: 

1
\((2-a)^{{3} \over 2}\)
2
\((a^2 - 1)^{{3} \over 2}\)
3
\((2 - a^2)^{{3} \over 2}\)
4
\(a^{{3} \over 2}\)

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