Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If sin α = 1/2 and sin β = 1/2, then what is the value of cos (α + β)? (0 degree < α, β < 90 degree) 

1
1/4
2
1
3
√3/2
4
1/2
5
None of the above

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