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Teza równoważna jest dowiedzeniu następującej prostej tożsamości:
\(\displaystyle{ bc \cdot \frac{\sqrt{bc \left(a+b+c \right) \left(b+c-a \right)}-ab \cos \left( \beta + \frac{\alpha}{2}\right)}{\left(b+c \right) \cdot \cos \left( \beta + \frac{\alpha}{2}\right)}+ \\ + c \cdot \frac{\sqrt{bc \left(a+b+c \right) \left(b+c-a \right)}-ab \cos \left( \beta + \frac{\alpha}{2}\right)}{\left(b+c \right) \cdot \cos \left( \beta + \frac{\alpha}{2}\right)} \cdot \frac{\sqrt{ac \left(a+b+c \right) \left(a-b+c \right)}- bc \cos \left(\gamma + \frac{\beta}{2} \right)}{\left(a+c \right) \cdot \cos \left(\gamma + \frac{\beta}{2} \right)}+abc=b \cdot \frac{\sqrt{bc \left(a+b+c \right) \left(b+c-a \right)}-ab \cos \left( \beta + \frac{\alpha}{2}\right)}{\left(b+c \right) \cdot \cos \left( \beta + \frac{\alpha}{2}\right)} \cdot \frac{\sqrt{ab \left(a+b+c \right) \left(a+b-c \right)}-bc \cos \left(\beta + \frac{\gamma}{2} \right)}{\left(a+b \right) \cdot \cos \left(\beta + \frac{\gamma}{2} \right)} + bc + ab \cdot \frac{\sqrt{ab \left(a+b+c \right) \left(a+b-c \right)}-bc \cos \left(\beta + \frac{\gamma}{2} \right)}{\left(a+b \right) \cdot \cos \left(\beta + \frac{\gamma}{2} \right)} + \\ + a \cdot \frac{\sqrt{ab \left(a+b+c \right) \left(a+b-c \right)}-bc \cos \left(\beta + \frac{\gamma}{2} \right)}{\left(a+b \right) \cdot \cos \left(\beta + \frac{\gamma}{2} \right)} \cdot \frac{\sqrt{ac \left(a+b+c \right) \left(a-b+c \right)}- bc \cos \left(\gamma + \frac{\beta}{2} \right)}{\left(a+c \right) \cdot \cos \left(\gamma + \frac{\beta}{2} \right)}}\)
\(\displaystyle{ bc \cdot \frac{\sqrt{bc \left(a+b+c \right) \left(b+c-a \right)}-ab \cos \left( \beta + \frac{\alpha}{2}\right)}{\left(b+c \right) \cdot \cos \left( \beta + \frac{\alpha}{2}\right)}+ \\ + c \cdot \frac{\sqrt{bc \left(a+b+c \right) \left(b+c-a \right)}-ab \cos \left( \beta + \frac{\alpha}{2}\right)}{\left(b+c \right) \cdot \cos \left( \beta + \frac{\alpha}{2}\right)} \cdot \frac{\sqrt{ac \left(a+b+c \right) \left(a-b+c \right)}- bc \cos \left(\gamma + \frac{\beta}{2} \right)}{\left(a+c \right) \cdot \cos \left(\gamma + \frac{\beta}{2} \right)}+abc=b \cdot \frac{\sqrt{bc \left(a+b+c \right) \left(b+c-a \right)}-ab \cos \left( \beta + \frac{\alpha}{2}\right)}{\left(b+c \right) \cdot \cos \left( \beta + \frac{\alpha}{2}\right)} \cdot \frac{\sqrt{ab \left(a+b+c \right) \left(a+b-c \right)}-bc \cos \left(\beta + \frac{\gamma}{2} \right)}{\left(a+b \right) \cdot \cos \left(\beta + \frac{\gamma}{2} \right)} + bc + ab \cdot \frac{\sqrt{ab \left(a+b+c \right) \left(a+b-c \right)}-bc \cos \left(\beta + \frac{\gamma}{2} \right)}{\left(a+b \right) \cdot \cos \left(\beta + \frac{\gamma}{2} \right)} + \\ + a \cdot \frac{\sqrt{ab \left(a+b+c \right) \left(a+b-c \right)}-bc \cos \left(\beta + \frac{\gamma}{2} \right)}{\left(a+b \right) \cdot \cos \left(\beta + \frac{\gamma}{2} \right)} \cdot \frac{\sqrt{ac \left(a+b+c \right) \left(a-b+c \right)}- bc \cos \left(\gamma + \frac{\beta}{2} \right)}{\left(a+c \right) \cdot \cos \left(\gamma + \frac{\beta}{2} \right)}}\)
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o ile się nie pomyliłem
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a wierzcie mi - to już jest nieźle uproszczone