Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

जर sin α = 1/2 आणि sin β = 1/2, तर cos (α + β) चे मूल्य किती असेल? (0°<α, β<90°)

1
1/4
2
1
3
√3/2
4
1/2

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