Hi, I have a hard time with this simple circuit from the book. We know that VL = 3*VR and additional we know that the phase shift between VR and VC is 45°. And our task is to find Vin in terms of VR. I did this And my answer is Vin = 2*√2*VR ≈ 2.83 but this is wrong because the answer given by the book is Vin = 2.86*VR . So what is wrong ?