If $\sin x + {\rm{cosec}}\,x = 2,$ then $sin^n x + cosec^n x$ is equal to
If $\sin x + {\rm{cosec}}\,x = 2,$ then $sin^n x + cosec^n x$ is equal to
- A
$2$
- B
${2^n}$
- C
${2^{n - 1}}$
- D
${2^{n - 2}}$
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