document.write( "Question 180514: If cos A>0 and tan A <0, then A is an angle in quadrant? \n" ); document.write( "
Algebra.Com's Answer #135287 by mgmoeab(37)![]() ![]() You can put this solution on YOUR website! If cos A>0, then cosA is positive \n" ); document.write( "and if tan A <0, then tanA is negative. \n" ); document.write( "Now, ask yourself--- \n" ); document.write( "where is cosx positive? (I AND IV QUADRANT) \n" ); document.write( "where is tanx negative? (II AND IV QUADRANT)\r \n" ); document.write( "\n" ); document.write( "ANGLE A CANT BE IN QUADRANT I BECAUSE IT DOESNT SATISFY THE CONDITION OF tanA BEING NEGATIVE. \n" ); document.write( "ANGLE A CANT BE IN QUADRANT II BECAUSE IT DOESNT SATISFY THE CONDITION OF cosA BEING POSITIVE.\r \n" ); document.write( "\n" ); document.write( "SINCE cosA IS POSITIVE AND tanA IS NEGATIVE IN QUADRANT IV, THEN A IS AN ANGLE IN THIS QUADRANT. \n" ); document.write( " \n" ); document.write( " |