document.write( "Question 1037376: Given $\"cos%28theta%29\"$ = - $\"7%2F25\"$ and 180° < $\"theta\"$ < 270°; find the exact value of $\"sin%28theta%2F2%29\"$ . \n" ); document.write( "

Algebra.Com's Answer #652042 by ikleyn(52803) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "Given $\"cos%28theta%29\"$ = - $\"7%2F25\"$ and 180° < $\"theta\"$ < 270°; find the exact value of $\"sin%28theta%2F2%29\"$ .
\n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "Use the formula of Trigonometry\r\n" );
document.write( "\r\n" );
document.write( " = \r\n" );
document.write( "\r\n" );
document.write( "(se the lesson Trigonometric functions of half argument in this site).\r\n" );
document.write( "\r\n" );
document.write( "You will have\r\n" );
document.write( "\r\n" );
document.write( " =  =  =  =  =  = .\r\n" );
document.write( "\r\n" );
document.write( "The sign \"+\" was chosen at the square root since the angle  lies in the 2-nd quadrant.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "For similar problems see the lessons\r
\n" ); document.write( "\n" ); document.write( " - Calculating trigonometric functions of angles\r
\n" ); document.write( "\n" ); document.write( " - Advanced problems on calculating trigonometric functions of angles\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );