evaluate 1/cos-isin in form of a+ib
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1/Cos A - i Sin A x Cos A + i Sin A / Cos A + i Sin A
Cos A + i Sin A / Cos²A - i² Sin²A
Cos A + i Sin A / Cos²A + Sin²A
Cos A + i Sin A
a = Cos A
b = Sin A
Cos A + i Sin A / Cos²A - i² Sin²A
Cos A + i Sin A / Cos²A + Sin²A
Cos A + i Sin A
a = Cos A
b = Sin A
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