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Neprekidni sigma | Continuous sigma #2

Izračunaj: \int_{-\pi}^{\pi} \left( 82+2(\cos x \sqrt{81-\sin^2x}-\sin^2x) \right) dx Zapiši rezultat u obliku a \cdot \pi. Kao odgovor na ovo pitanje napiši samo vrijednost a.
Evaluate: \int_{-\pi}^{\pi} \left( 82+2(\cos x \sqrt{81-\sin^2x}-\sin^2x) \right) dx Write the answer in the form a \cdot \pi, as the answer to this question write a