Question 987492
Simplify the expression 

{{{ sqrt( 9-x^2 ) }}}
This cannot be "simplified."
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as much as possible after substituting 3 sin &#952; for x. (Assume 0° < &#952; < 90°.)
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If you sub 3sin(t) for x, then it's a different expression.
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--> {{{ sqrt( 9 - (3sin(t))^2 ) }}}
= {{{sqrt(9 - 9sin^2(t))}}}
= {{{sqrt((9)*(1 - sin^2(t)))}}}
= {{{sqrt((9)*cos^2(t)))}}}
= 3cos(t)
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Silly problem.