यदि sin \({\rm{x}} = \frac{1}{{\sqrt 5 }},\) sin \({\rm{y}} = \frac{1}{{\sqrt {10} }}\) है, जहाँ \(0 < {\rm{x}} < \frac{{\rm{\pi }}}{2},{\rm{\;}}0 < {\rm{y}} < \frac{{\rm{\pi }}}{2},\) है, तो (x + y) किसके बराबर है?

1
π
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π/2
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π/4
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