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Simplify (sin42degrees)cos38degrees-(cos42degrees)sin38degrees

This is for my trig class, thanks for the help!

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
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 This is formula for Sin ( A - B) = Sin A Cos B - Cos B Sin A
 
     In this case
 
     A = 42° , and B = 38°
 
    The formula reduces to Sin ( 42° - 38° ) = Sin 4°