railway RRB Group D Mock Test Series 2024-25 Quantitative Aptitude Geometry Quadrilaterals

ଯଦି ABCD ଏକ ଚକ୍ରିୟ ଚତୁର୍ଭୁଜ ଅଟେ, ତେବେ  cos2A – cos2B – cos2C + cos2D ର ମୂଲ୍ୟ ହେଉଛି:

1
-1 
2
1 
3
 0 
4
 2 
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