document.write( "Question 1076452: can someone help me with this problem please? THANK YOU! \r
\n" ); document.write( "\n" ); document.write( "Write the product as a sum using a product-to-sum identity. cos(-8a)sin(10a) \n" ); document.write( "
Algebra.Com's Answer #691163 by ikleyn(52781)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "For the product-to-sum identity see the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Product of trigonometric functions\r
\n" ); document.write( "\n" ); document.write( "    - Product of trigonometric functions - Examples\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Trigonometry\". \r
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