document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1163854>Question 1163854</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Express each of the following in terms of functions of theta.<BR>\n" );
document.write( "a. cos(pi/4 - theta) = ?<BR>\n" );
document.write( "b. sin(theta + 30deg) = ?\r<BR>\n" );
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document.write( "I don't really get the question too well? Am I supposed to rewrite the terms as other trig functions? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #788091 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=788091\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
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document.write( "Use the sum and difference identities and the common values of sine and cosine.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \cos(\alpha\,-\,\beta)\ =\ \cos\alpha\cos\beta\ +\ \sin\alpha\sin\beta\">\r<BR>\n" );
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document.write( "So, for your situation:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \cos(\frac{\pi}{4}\,-\,\theta)\ =\ \cos\frac{\pi}{4}\cos\theta\ +\ \sin\frac{\pi}{4}\sin\theta\">\r<BR>\n" );
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document.write( "You know, or should by now know, that <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \cos\frac{\pi}{4}\ =\ \sin\frac{\pi}{4}\ =\ \frac{\sqrt{2}}{2}\">, so:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \cos(\frac{\pi}{4}\,-\,\theta)\ =\ \frac{\sqrt{2}}{2}\cos\theta\ +\ \frac{\sqrt{2}}{2}\sin\theta\ =\ \frac{\sqrt{2}}{2}\(\cos\theta\ +\ \sin\theta\)\">\r<BR>\n" );
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document.write( "Which is, as required, a function of <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \theta\">\r<BR>\n" );
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document.write( "I'll leave the second problem to you.  If you don't remember the identities, Google \"Sine of the Sum and Difference\".  I trust you can recall the values for sine and cosine of <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \frac{\pi}{6}\"> or <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large 30^\circ\">.\r<BR>\n" );
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document.write( "																<BR>\n" );
document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi}\ +\ 1\ =\ 0\"><BR>\n" );
document.write( "My calculator said it, I believe it, that settles it<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \ \\r\"> </SPAN>\n" );
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