sin²a+cos²a=1
sin²a+(-√6/4)²=1
sin²a+3/8=1
sin²a=5/8
sina=√(5/8)
sina=√10/4
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sin²a+cos²a=1
sin²a+(-√6/4)²=1
sin²a+3/8=1
sin²a=5/8
sina=√(5/8)
sina=√10/4