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#### bw0young0math

##### New member

- Jun 14, 2013

- 27

Why arctan(5/-5) is different from arctan-1(-5/5)?????

tan-1(5/-5)=3ㅠ/4 +2kㅠ

tan-1(-5/5)=-1ㅠ/4+2kㅠ (k :arbtrary integer.)

Why can't I calculate just arctan(-1)?

I thought that it is related withe tangent peoriod ㅠ not 2ㅠ.

However I can't know that exactly.

Please help me....