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mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>1</mn><mi mathvariant="normal">&#xA0;</mi><mo>+</mo><mi mathvariant="normal">&#xA0;</mi><mi>tanA</mi><mo>.</mo><mi>tan</mi><mo>(</mo><mi mathvariant="normal">A</mi><mo>/</mo><mn>2</mn><mo>)</mo><mspace linebreak="newline"/><mo>=</mo><mn>1</mn><mo>+</mo><mfrac><mrow><mn>2</mn><mi>tanA</mi><mo>/</mo><mn>2</mn></mrow><mrow><mn>1</mn><mo>-</mo><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi><mo>/</mo><mn>2</mn></mrow></mfrac><mo>&#xD7;</mo><mi>tanA</mi><mo>/</mo><mn>2</mn><mspace linebreak="newline"/><mo>=</mo><mn>1</mn><mo>+</mo><mfrac><mrow><mn>2</mn><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi><mo>/</mo><mn>2</mn></mrow><mrow><mn>1</mn><mo>-</mo><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi><mo>/</mo><mn>2</mn></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>1</mn><mo>-</mo><msup><mi>tan</mi><mn>2</mn></msup><mn>4</mn><mo>/</mo><mn>2</mn><mo>+</mo><mn>2</mn><msup><mi>tan</mi><mn>2</mn></msup><mn>4</mn><mo>/</mo><mn>2</mn></mrow><mrow><mn>1</mn><mo>-</mo><msup><mi>tan</mi><mn>2</mn></msup><mn>4</mn><mo>/</mo><mn>2</mn></mrow></mfrac><mspace linebreak="newline"/><mo>=</mo><mfrac><mrow><mn>1</mn><mo>+</mo><mn>2</mn><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi><mo>/</mo><mn>2</mn></mrow><mrow><mn>1</mn><mo>-</mo><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi><mo>/</mo><mn>2</mn></mrow></mfrac><mo>=</mo><mfenced open="[" close="]" separators="|"><mrow><mo>&#x2235;</mo><mi>cos</mi><mn>2</mn><mi mathvariant="normal">A</mi><mo>=</mo><mfrac><mrow><mn>1</mn><mo>-</mo><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi></mrow><mrow><mn>1</mn><mo>+</mo><msup><mi>tan</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi></mrow></mfrac></mrow></mfenced><mspace linebreak="newline"/><mo>=</mo><mfrac><mn>1</mn><mrow><mi>cos</mi><mo>&#x2061;</mo><mfenced separators="|"><mrow><mn>2</mn><mo>&#xD7;</mo><mfrac><mi mathvariant="normal">A</mi><mn>2</mn></mfrac></mrow></mfenced></mrow></mfrac><mo>=</mo><mfrac><mn>1</mn><mi>cosA</mi></mfrac><mo>=</mo><mi>secA</mi></math>