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Sir, I am unable to understand the calculation in part 2? Please address my query as soon as possible.

In the calculation of part (ii): we are multiplying by 5 to numerator and denomerator of right hand side of equation. x = 5/5(3sinwt + 4sinwt) when we simplify: x = 5{(3/5) sinwt + (4/5) sinwt} we will get the equation

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