Объяснение:
1) = - int(x d(cos x)) = -x cos(x) + int(cos(x) dx) = - xcos(x) + sin(x) + C
2) = - xcos(x) + sin(x)|0,pi = pi
int - интеграл)
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Объяснение:
1) = - int(x d(cos x)) = -x cos(x) + int(cos(x) dx) = - xcos(x) + sin(x) + C
2) = - xcos(x) + sin(x)|0,pi = pi
int - интеграл)