document.write( "Question 943988: Multiply (-2 cis 75°)(3 cis-45°) and express the answer in rectangular coordinates.\r
\n" ); document.write( "\n" ); document.write( "A)(3√6/2)+(3√2/2i)
\n" ); document.write( "B)-3√3-3i
\n" ); document.write( "C)(3√3/2)-9/2i
\n" ); document.write( "D)-√3+i\r
\n" ); document.write( "\n" ); document.write( "I multiplied those and got -6 cis 30°, but now I'm having trouble figuring out how to convert it.
\n" ); document.write( "

Algebra.Com's Answer #575564 by Alan3354(69443)\"\" \"About 
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Multiply (-2 cis 75°)(3 cis-45°) and express the answer in rectangular coordinates.\r
\n" ); document.write( "\n" ); document.write( "A)(3√6/2)+(3√2/2i)
\n" ); document.write( "B)-3√3-3i
\n" ); document.write( "C)(3√3/2)-9/2i
\n" ); document.write( "D)-√3+i\r
\n" ); document.write( "\n" ); document.write( "I multiplied those and got -6 cis 30°, but now I'm having trouble figuring out how to convert it.
\n" ); document.write( "----------
\n" ); document.write( "-6cis(30) = -6cos(30) - 6i*sin(30)
\n" ); document.write( "= -3sqrt(3) - 3i
\n" ); document.write( "
\n" );