document.write( "Question 903166: Use trigonometric identities to find the exact value of tan theta if sin theta=1/3 and tan theta<0 \n" ); document.write( "

Algebra.Com's Answer #547837 by Edwin McCravy(20056) $\"\"$ $\"About$

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document.write( "Since  then  is either in QII or QIV.\r\n" );
document.write( "Since  is given as a positive number , then\r\n" );
document.write( " is in QII\r\n" );
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document.write( "So\r\n" );
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document.write( "(1)   \r\n" );
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document.write( "But we will need , which is negative in QII.\r\n" );
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document.write( "  <-- we take the negative square root since cosine is negative in QII\r\n" );
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document.write( "Now go back to equation (1)\r\n" );
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document.write( "Edwin

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