document.write( "Question 1070150: Use the information given below to find sin(Alpha + Beta). \r
\n" ); document.write( "\n" ); document.write( "cos alpha = 4/5, with alpha in quadrant I. \r
\n" ); document.write( "\n" ); document.write( "cos Beta = - 4/5, with Beta in quadrant III. \r
\n" ); document.write( "\n" ); document.write( "give the exact answer not a decimal approximation. \r
\n" ); document.write( "\n" ); document.write( "sin (a + B) = __________________\r
\n" ); document.write( "\n" ); document.write( " MY NOTES: How is this calculated? I am able to find
\n" ); document.write( "sin(B) is -3/5
\n" ); document.write( "sin (a) is 3/5
\n" ); document.write( "(please verify if I am on the correct track. Is there a calculator for this?) Thank you. \r
\n" ); document.write( "\n" ); document.write( "sin (a + B) = __________________
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #685264 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Use the formula,
\n" ); document.write( " $\"sin%28a%2Bb%29=sin%28a%29cos%28b%29%2Bcos%28a%29sin%28b%29\"$
\n" ); document.write( "and substitute the values you have and calculated. \n" ); document.write( "

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