Today's calculation of Integral 223
Source: Toyama University entrance exam 1964
August 29, 2007
calculusintegrationtrigonometrycalculus computations
Problem Statement
Evaluate \int_{0}^{\pi}\sqrt{(\cos x\plus{}\cos 2x\plus{}\cos 3x)^{2}\plus{}(\sin x\plus{}\sin 2x\plus{}\sin 3x)^{2}}\ dx.