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∫(ot π/2 do π) 3sin(x/2 +π/4)dx=3*(2/1)*(-cos(x/2+π/4)|(ot π/2 do π)= =-6(cos(π/2+π/4) - cos(π/4+π/4)=-6*(cos3π/4 -cosπ/2)=-6*(cos(π-π/4)-0)= =-6*(-cosπ/4)=6*√2 /2=3√2