document.write( "Question 529275: This is a trignometry problem on proving identities
\n" ); document.write( "I can use:double-angle,sum and difference,phythagorean identities, and ratios\r
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\n" ); document.write( "Prove: sin(3q) = 3sin(q) - 4sin³(q)\r
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Algebra.Com's Answer #349557 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
sin(3q)
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\n" ); document.write( "sin(2q)cos(q) + cos(2q)sin(q)
\n" ); document.write( "[2sin(q)cos(q)]cos(q) + [cos²(q)-sin²(q)]sin(q)
\n" ); document.write( "2sin(q)cos²(q) + [1-sin²(q)-sin²(q)]sin(q)
\n" ); document.write( "2sin(q)cos²(q) + [1-2sin²(q)]sin(q)
\n" ); document.write( "2sin(q)[1-sin²(q)] + sin(q) - 2sin³(q)
\n" ); document.write( "2sin(q) - 2sin³(q) + sin(q) - 2sin³(q)
\n" ); document.write( "3sin(q) - 4sin³(q)\r
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