The area under the curve $y=|\cos x-\sin x|, 0 \leq x \leq \frac{\pi}{2}$, and above $x$-axis is :
$2 R_{1}=3 R_{2}$
$R_{1}=R_{2}$
$3 R_{1}=2 R_{2}$
$R_{1}=2 R_{2}$
Correct Option: , 4
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