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Problem : Express the following as a sum or difference: sin(56)cos(42).
sin(56)cos(42) =
(sin(56 + 42) + sin(56 - 42)) = (sin(98) + sin(14)).
Problem : Express the following as a sum or difference: cos(115)cos(60).
cos(115)cos(60) =(cos(115 + 60) + cos(115 - 60)) = (cos(175) + cos(55)).
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