document.write( "Question 396007: How do I solve the following question: 8 sin cube x - 18 sin square x + 13 sinx - 3 = 0, xE[-pi/2, pi)? \n" ); document.write( "
Algebra.Com's Answer #281027 by Alan3354(69443)\"\" \"About 
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Sub y for sin(x)
\n" ); document.write( "\"8y%5E3+-+18y%5E2+%2B+13y+-+3+=+0\"
\n" ); document.write( "You can see that 8+13 = -(-18-3) so f(-1) = 0 and y=1 is a zero.
\n" ); document.write( "Divide by (y-1) and solve the quadratic.
\n" ); document.write( "Sub sin(x) for y.
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