![\bf sin\left( \sqrt{x^2+1} \right)\implies sin\left[ ( x^2+1 )^{\frac{1}{2}} \right] \\\\\\ \stackrel{chain~rule}{cos\left[ ( x^2+1 )^{\frac{1}{2}} \right]\cdot \cfrac{1}{2}( x^2+1 )^{-\frac{1}{2}}\cdot 2x} \\\\\\ cos\left[ ( x^2+1 )^{\frac{1}{2}} \right]\cdot \cfrac{x}{( x^2+1 )^{\frac{1}{2}}}\implies \cfrac{x~cos\left( \sqrt{x^2+1}\right)}{\sqrt{x^2+1}}](/tpl/images/0254/4996/74e34.png)
How to solve question 1a? very confused?
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