If cos (α - Π / 6) + sin α = (4 / 5) √ 3 is known, then what is the value of sin (α + 7 Π / 6)?

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• 20. Given cos (a - π / 6) + sin α = 4 √ 3 / 5, then the value of sin (α - 7 π / 6) is My answers are - (4 + 3 √ 3) / 10 and - (4-3 √ 3) / 10, but not in the options Ask for detailed explanation