ariant="italic">nd</mi>
                                </msub>
                                <mo>+</mo>
                                <mn>1</mn>
                            </mrow>
                        </mfenced>
                        <mo>⁢</mo>
                        <mfenced open="(" close=")">
                            <mfrac>
                                <mi mathvariant="italic">height</mi>
                                <mn>2</mn>
                            </mfrac>
                