Prove that: $\left|\sqrt{\frac{1-\sin x}{1+\sin x}}+\sqrt{\frac{1+\sin – InterviewSolution

1.	Prove that: $\left\|\sqrt{\frac{1-\sin x}{1+\sin x}}+\sqrt{\frac{1+\sin x}{1-\sin x}}\right\|=-\frac{2}{\cos x},$ where $\frac{\pi}{2}<x<\pi$
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