How we know the answer of tan-1 of polar will be system Deg or rad

Hi



How we know the answer of tan-1 of polar will be Deg or rad in calcolator



because i see in some questions the solving was Deg and anthor by rad

for example (write in polar)
1) -8 + 5i ----- > here we use rad to find tan-1
2) -3 - 5i ------> here we use deg to find tan-1

please i want help

Quote:

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Originally Posted by r-soy

Hi



How we know the answer of tan-1 of polar will be Deg or rad in calcolator



because i see in some questions the solving was Deg and anthor by rad

for example (write in polar)
1) -8 + 5i ----- > here we use rad to find tan-1
2) -3 - 5i ------> here we use deg to find tan-1

please i want help

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You look to see what angle mode the calculator is in (it is usually a small field in the dispaly area). If there is no such flag then always set the mode before using any trig functions.

CB