In △ABC,∠B=90∘ and sin A=513, then sec2A−tan2A= ______________

1.	In △ABC,∠B=90∘ and sin A=513, then sec2A−tan2A= __________________
Answer» In $△ A B C, ∠ B = 90^{\circ}$ and $s i n A = \frac{5}{13}$ , then $s e c^{2} A - t a n^{2} A =$ __________________

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