The value of $\cos 15^\circ - \sin 15^\circ $ is equal to
The value of $\cos 15^\circ - \sin 15^\circ $ is equal to
- A
$\frac{1}{{\sqrt 2 }}$
- B
$\frac{1}{2}$
- C
$ - \frac{1}{{\sqrt 2 }}$
- D
$0$
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- [JEE MAIN 2019]
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