<svg xmlns="http://www.w3.org/2000/svg" xmlns:wrs="http://www.wiris.com/xml/mathml-extension" height="23" width="88" wrs:baseline="19"><!--MathML: <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">&#x3C0;</mi><mo>-</mo><mn>2</mn><msup><mi>tan</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#xA0;</mo><mi mathvariant="normal">x</mi></math>--><defs><style type="text/css">@font-face{font-family:'math14815fbe9b70485d2790357a6a9';src:url(data:font/truetype;charset=utf-8;base64,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)format('truetype');font-weight:normal;font-style:normal;}</style></defs><text font-family="math14815fbe9b70485d2790357a6a9" font-size="16" text-anchor="middle" x="6.5" y="19">&#x3C0;</text><text font-family="math14815fbe9b70485d2790357a6a9" font-size="16" text-anchor="middle" x="19.5" y="19">&#x2212;</text><text font-family="Arial" font-size="16" text-anchor="middle" x="31.5" y="19">2</text><text font-family="Arial" font-size="16" text-anchor="middle" x="47.5" y="19">tan</text><text font-family="math14815fbe9b70485d2790357a6a9" font-size="12" text-anchor="middle" x="63.5" y="12">&#x2212;</text><text font-family="Arial" font-size="12" text-anchor="middle" x="71.5" y="12">1</text><text font-family="Arial" font-size="16" text-anchor="middle" x="83.5" y="19">x</text></svg>