This question contains the following two questions $(a)$ and $(b).$

$($a$)(6$ MARKS$)$ Find ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x}{\sqrt[\phantom{2}]{5-x^2}}dx$

$($b$)(4$ MARKs$)$ Use the result in $(a)$ to evaluate ${\displaystyle \underset{1}{\overset{2}{}}}\frac{x}{\sqrt[\phantom{2}]{6-x^2}}dx$

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