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## Main Question or Discussion Point

How do you calculate Arccosine and Arctangent if you do not have a scientific calculator.

[tex]\theta = atan(\frac{y}{x})[/tex]

[tex]\theta2 = acos(\frac{z}{\sqrt{x^2+y^2+z^2}})[/tex]

[tex]\theta = atan(\frac{y}{x})[/tex]

[tex]\theta2 = acos(\frac{z}{\sqrt{x^2+y^2+z^2}})[/tex]