Answer to Question #192993 in Algebra for OhMoe

Question #192993

If α is in quadrant 4, which quadrant is arccos(tanα) in? 


1
Expert's answer
2021-05-14T10:57:01-0400

we know that how arccosine is restricted in quadrants,


The arccosine of a positive number is a first quadrant angle, cos-1(+) is in quadrant I.


The arccosine of a negative number is a second quadrant angle,

cos-1(-) is in quadrant II.





and we know that,

tan(x ) is negative in forth quadrant

so,

arccosine of -ve will be in second quadrant.


therefore,

arccos(tanα) will be in second quadrant.




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