Find the unit vectors that are parallel to the tangent line to the curve y = 8 sin x

Find the unit vectors that are parallel to the tangent line to the curve y = 8 sin x

题目
Find the unit vectors that are parallel to the tangent line to the curve y = 8 sin x
at the point (π/6,4).(Enter your answer as a comma-separated list of vectors.)
答案
你华大的吧?
答案是(1/7,(4根号3)/7),(-1/7,-(4根号3)/7),submit已过~
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