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Question Number 28921 by 803jaideep@gmail.com last updated on 01/Feb/18

Answered by Joel578 last updated on 01/Feb/18

$$10\cos \left(200t\right)=8$$$$\cos \left(200t\right)=0.8$$$$200t={\cos }^{-1}(0.8)\approx 37°$$

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