Ответ:
2sin((a+b+a-b)/2)cos((a+b-a+b)/2)
2sin((2a)/2)cos((2b)/2)
2sin(a)cos(b)
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Ответ:
2sin((a+b+a-b)/2)cos((a+b-a+b)/2)
2sin((2a)/2)cos((2b)/2)
2sin(a)cos(b)