A possible value of <img alt="\tan \left ( \frac{1}{4}\sin ^{-1}\frac{\sqrt{63}}{8} \right )" src="https://entrancecorner.codecogs.com/gif.latex?%5Ctan%20%5Cleft%20%28%20%5Cfrac%7B1%7D%7B4%7D%5Csin%20%5E%7B-1%7D%5Cfrac%7B%5Csqrt%7B63%7D%7D%7B8%7D%20%5C