document.write( "Question 1056959: let sinA= 3/5 with A in Q2 and sinB= -5/13 with b in quadrant 3. find sin(A+B), cos(a+b), and tan(a+b). where does a and b terminate \n" ); document.write( "

Algebra.Com's Answer #672033 by ikleyn(52799) $\"\"$ $\"About$

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\n" ); document.write( "let sinA= 3/5 with A in Q2 and sinB= -5/13 with B in quadrant 3. find sin(A+B), cos(a+b), and tan(a+b). where does a and b terminate
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document.write( "Use the formulas \r\n" );
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document.write( " =     (1)\r\n" );
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document.write( "   and\r\n" );
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document.write( " = .   (2)\r\n" );
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document.write( "Regarding these formulas, see the lesson Addition and subtraction formulas in this site.\r\n" );
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document.write( "In addition to the given  sin(A) =   and  sin(B) = , you need to know  cos(A) and cos(B).\r\n" );
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document.write( "1.  cos(A) =  =  =  =  =  = .\r\n" );
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document.write( "   The sign \"-\" was chosen for the square root because cosine is negative in Q2.\r\n" );
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document.write( "2.  cos(B) = =  =  =  =  =  = = .\r\n" );
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document.write( "   The sign \"-\" was chosen for the square root because cosine is negative in Q3.\r\n" );
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document.write( "Now all you need to do is to substitute everything into the formulas (1) and (2) and make the calculations.\r\n" );
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document.write( " =  =  =  = ,   and\r\n" );
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document.write( " =  =  =  = .\r\n" );
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document.write( "Finally, tan(A+B) =  =  = .\r\n" );
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\n" ); document.write( "\n" ); document.write( "The last question \"where does a and b terminate\" is just answered in your condition.\r
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