ଯଦି sin α = 1/2 ଏବଂ sin β = 1/2, ତେବେ cos (α + β) ର ମୂଲ୍ୟ କ’ଣ? (0 ଡିଗ୍ରୀ <α, β <90 ଡିଗ୍ରୀ)

1
1/4
2
1
3
√3 / 2
4
1/2 

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