document.write( "Question 965164: I've been working through my homework for several hours and have gotten stuck. Any help is appreciated!\r
\n" ); document.write( "\n" ); document.write( "Using a double-angle or half-angle formula to simplify the given expressions. \r
\n" ); document.write( "\n" ); document.write( " (a) If cos^2(29∘)−sin^2(29∘)=cosA∘, then
\n" ); document.write( "A= ___ degrees;
\n" ); document.write( " (b) If cos^2(2x)−sin^2(2x)=cosB, then
\n" ); document.write( "B= ___. \n" ); document.write( "
Algebra.Com's Answer #589902 by Murthy(22)\"\" \"About 
You can put this solution on YOUR website!
(a) If cos^2(29∘)−sin^2(29∘)=cosA∘, then \r
\n" ); document.write( "\n" ); document.write( "we have,\r
\n" ); document.write( "\n" ); document.write( "cos^2(theta)−sin^2(theta∘)=cos2(theta)∘\r
\n" ); document.write( "\n" ); document.write( "therefore,\r
\n" ); document.write( "\n" ); document.write( "A=58∘\r
\n" ); document.write( "\n" ); document.write( "(b) If cos^2(2x)−sin^2(2x)=cosB,\r
\n" ); document.write( "\n" ); document.write( "cos^2(theta)−sin^2(theta∘)=cos2(theta)∘\r
\n" ); document.write( "\n" ); document.write( "therefore,cos(4x)=cosB\r
\n" ); document.write( "\n" ); document.write( "or 4x=B\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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