Calculate the energy stored in a 1000 μF capacitor at t = 50μs if the voltage across it is 1.5 cos 105t volts. The answer is 90.52 uJ but I can't figure out what I am doing wrong. Can someone help me

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ISBN:9781337399128
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Chapter8: Basic Electric Motors
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Calculate the energy stored in a 1000 μF capacitor at t = 50μs if the voltage across it is 1.5 cos 105t volts. The answer is 90.52 uJ but I can't figure out what I am doing wrong. Can someone help me?

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