Question

What is this question​

Answer 1

Answer:

$\frac{1 - {tan}^{2}45 }{1 + {tan}^{2}45 } \\ \\ = \frac{1 - {(1)}^{2} }{1 + {(1)}^{2} } \\ \\ = \frac{1 - 1}{1 + 1 } \\ \\ = \frac{0}{2} \\ \\ = 0$

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Answer 2

0 is the answer.

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