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April 20, 2021 4:40 pm 30 pts
general soliution of cos theta is (2n+1)Π/2.. . . .. . . . . . . . . . .. . . . . . .. . . . .. . . . . .. .
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• Alka gupta
see...here cos(thetha) not equal to zero.... here cos(Thetha) = 1 hence thetha = 2nπ for all n€ N if they written nπ then here it should be mentioned that n is even integer
book solution is correct .