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Alexx1012
a fost răspuns

Sa se transforme in produs:
cos a - cos b + sin(a + b)

Răspuns :

Targoviste44

[tex]\it cos a - cos b + sin(a + b) =(cos a - cos b) + sin(a + b)=\\ \\ =-2sin\dfrac{a+b}{2}sin\dfrac{a-b}{2}+2sin\dfrac{a+b}{2}cos\dfrac{a+b}{2} =2sin\dfrac{a+b}{2}\Big(cos\dfrac{a+b}{2}\ -\ sin\dfrac{a-b}{2}\Big)[/tex]

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