If sinθ+ cosecθ=2, then the value of $sin^{-7}$θ + $cosec^{7}$θ is

If sinθ+ cosecθ=2, then the value of $sin^{-7}$θ + $cosec^{7}$θ is
1). $2^{7}$
2). $2^{-7}$
3). 2
4). $2^{1}$

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