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Summary:: I don't seem to see any problem with my work. But my final answer does not match the correct answer. (In number 3)
Here's my work
Here's my work
As mentioned, it's best if you type your work into the forum to make it more legible. Please see the LaTeX Guide link below the Edit window for more information on how to format math equations at PF. Thanks.I don't seem to see any problem with my work.
Following your entire calculation this it is not an issue. The only mistake it is wrong calculation of IR.I agree with the berkeman, of course. However, I manage to read your calculation. I still have to recalculate, but at first glance, I have a general observation: to convert the arguments from negative to positive you have to add 360 degrees and not 180.