Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

sin α = 1/2 మరియు sin β = 1/2 అయితే, cos (α + β) విలువ ఎంత? (0 డిగ్రీ < α, β < 90 డిగ్రీ )

1
1/4
2
1
3
√3/2
4
1/2

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