Question 67378
A.) Arctan(tan 315 degrees)
The range of arctan is -90 to 90
so the answer is 
315 or -45 degrees
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B.)Arctan (tan 150 degrees)
The range of arctan is -90 to 90
So the answer looks like 150 degrees
but the equivalent tangent is in the 
4th quadrant where the answer is -30.
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Cheers,
Stan H.