Which of the following gives a value of cos ( arcsin ( 9 − x 2 3 ) ) {\displaystyle \cos \left(\arcsin \left({\frac {\sqrt {9-x^{2}}}{3}}\right)\right)} ?
(a) 3 x {\displaystyle {\frac {3}{x}}}
(b) x 3 {\displaystyle {\frac {x}{3}}}
(c) 9 − x 2 x {\displaystyle {\frac {\sqrt {9-x^{2}}}{x}}}
(d) x 9 − x 2 {\displaystyle {\frac {x}{\sqrt {9-x^{2}}}}}
(e) 3 9 − x 2 {\displaystyle {\frac {3}{\sqrt {9-x^{2}}}}}
?
