The value of $\cos A - \sin A$ when $A = \frac{{5\pi }}{4},$ is
The value of $\cos A - \sin A$ when $A = \frac{{5\pi }}{4},$ is
- A
$\sqrt 2 $
- B
$\frac{1}{{\sqrt 2 }}$
- C
$0$
- D
$1$
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