ag-gipp/GoUldI

<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mrow><mi>gd</mi><msup><mi></mi><mn>-1</mn></msup></mrow><mrow><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mi>x</mi><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo></mrow><mo>=</mo><mi>ln</mi><mi>tan</mi><mrow><mo rspace="0.3em" lspace="0em" stretchy="true" fence="true" form="prefix">(</mo><mstyle scriptlevel="0" displaystyle="false"><mrow><mfrac linethickness="1"><mn>1</mn><mn>2</mn></mfrac></mrow></mstyle><mi>x</mi><mo>+</mo><mstyle scriptlevel="0" displaystyle="false"><mrow><mfrac linethickness="1"><mn>1</mn><mn>4</mn></mfrac></mrow></mstyle><mi>&#x003C0;</mi><mo rspace="0em" lspace="0.3em" stretchy="true" fence="true" form="postfix">)</mo></mrow></mrow></math>