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If f'(x)=k(cos x-sinx), f'(0)=3, f((pi)...

If `f'(x)=k(cos x-sinx)`, `f'(0)=3`, `f((pi)/(2))=15`, find f(x)

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To solve the problem, we start with the given information: 1. The derivative of the function is given by: \[ f'(x) = k(\cos x - \sin x) \] 2. We also have the conditions: ...
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