sin A + cos A (or sin A - cos A) given: square to get sin A cos A, then evaluate

1. A.
   $\frac{9}{50}$
2. B.
   $\frac{-9}{50}$
3. C.
   $\frac{9}{25}$
4. D.
   $\frac{-9}{25}$

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1. A.
   $\frac{5}{13}$
2. B.
   $\frac{79}{128}$
3. C.
   $\frac{79}{126}$
4. D.
   $\frac{7}{13}$

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1. A.
   $\frac{2\sqrt{2} - 1}{8}$
2. B.
   $\frac{2\sqrt{6} - 1}{8}$
3. C.
   $\frac{3\sqrt{2} - 1}{4}$
4. D.
   $\frac{2\sqrt{3} - 1}{4}$

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1. A.
   $\frac{1}{4}$
2. B.
   $\frac{5}{18}$
3. C.
   $\frac{7}{8}$
4. D.
   $\frac{9}{16}$

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1. A.
   $x$
2. B.
   $x^2$
3. C.
   $1$
4. D.
   $x + 1$

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1. A.
   0
2. B.
   1
3. C.
   2
4. D.
   3

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1. A.
   $1$
2. B.
   $\frac{1}{2}$
3. C.
   $\frac{3}{4}$
4. D.
   $\frac{5}{8}$

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1. A.
   $1$
2. B.
   $\sqrt{2}$
3. C.
   $\frac{3}{4}$
4. D.
   $\frac{1}{2}$

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