document.write( "Question 1072041: Can you help me convert this to trigonometric form? $\"+z+=+-9%2F4+\"$ + $\"+9+sqrt%28+3+%29%2F4+\"$ i
\n" ); document.write( "A.) 81/4(sin120 + i cos120)
\n" ); document.write( "B.) 81/4(cos120 + i sin120)
\n" ); document.write( "C.) 9/2(cos120 + i sin120)
\n" ); document.write( "D.) 9/2(cos120 + i sin 90)
\n" ); document.write( "Thank you. \n" ); document.write( "

Algebra.Com's Answer #686944 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"r%5E2=a%5E2%2Bb%5E2\"$
\n" ); document.write( " $\"r%5E2=81%2F16%2B243%2F16\"$
\n" ); document.write( " $\"r%5E2=324%2F16\"$
\n" ); document.write( " $\"r=18%2F4\"$
\n" ); document.write( " $\"r=9%2F2\"$
\n" ); document.write( "Recognize that theta is in QII (cos negative, sin positive).
\n" ); document.write( "Recognize also that $\"cos%28theta%29%2Bi%2Asin%28theta%29\"$ is the required form.
\n" ); document.write( " \n" ); document.write( "

\n" );