document.write( "Question 1169844: Can someone please help me with this question?! Thank you!
\n" ); document.write( "If cos(alpha)=0.228 and cos(beta)=0.836 with both angles' terminal rays in Quadrant-I, find the values of
\n" ); document.write( "a) cos(alpha + beta)
\n" ); document.write( "b) sin(alpha + beta)
\n" ); document.write( "Your answers should be accurate to 4 decimal places. \n" ); document.write( "

Algebra.Com's Answer #794667 by greenestamps(13200) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( "(1) Given cos(alpha) and cos(beta) and the fact that both angles are in quadrant I, use $\"sin%28x%29%5E2%2Bcos%28x%29%5E2=1\"$ to find sin(alpha) and sin(beta).

\n" ); document.write( "(2) $\"cos%28alpha%2Bbeta%29+=+cos%28alpha%29%2Acos%28beta%29-sin%28alpha%29%2Asin%28beta%29\"$
\n" ); document.write( "(3) $\"sin%28alpha%2Bbeta%29+=+sin%28alpha%29%2Acos%28beta%29%2Bcos%28alpha%29%2Asin%28beta%29\"$

\n" ); document.write( "You can do the calculations. \n" ); document.write( "

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