What is the simplified value of $\sqrt{\frac{1}{sin^{2}A}+\frac{1}{cos^{2}A}}$ ?

What is the simplified value of $\sqrt{\frac{1}{sin^{2}A}+\frac{1}{cos^{2}A}}$ ?
1). sin A cos A
2). tan A + cot A
3). sin 2A
4). tan A cot A

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