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223

Part of 2007 Today's Calculation Of Integral

Problems(1)

Today's calculation of Integral 223

Source: Toyama University entrance exam 1964

8/29/2007
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.
calculusintegrationtrigonometrycalculus computations