{ Ø tan (+ Ø ) = tan Ø as tan b (+) we in 3rd quadrant)}
∈
<p><span title="Click to copy mathml"><math><mrow><mi>t</mi><mi>a</mi><msup><mrow><mi>n</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mrow><mo> (</mo><mrow><mi>t</mi><mi>a</mi><mi>n</mi><mfrac><mrow><mn>7</mn><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mrow><mo>)</mo></mrow><mo>=</mo><mi>t</mi><mi>a</mi><msup><mrow><mi>n</mi></mrow><mrow><mn>1</mn></mrow></msup><mrow><mo> (</mo><mrow><mi>t</mi><mi>a</mi><mi>n</mi><mfrac><mrow><mn>6</mn><mi>π</mi><mo>+</mo><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mrow><mo>)</mo></mrow></mrow></math></span></p><p><span title="Click to copy mathml"><math><mrow><mo>=</mo><mi>t</mi><mi>a</mi><msup><mrow><mi>n</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mrow><mo> (</mo><mrow><mi>t</mi><mi>a</mi><mi>n</mi><mfrac><mrow><mn>6</mn><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac><mo>+</mo><mfrac><mrow><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mrow><mo>)</mo></mrow></mrow></math></span></p><p><span title="Click to copy mathml"><math><mrow><mo>=</mo><mi>t</mi><mi>a</mi><msup><mrow><mi>n</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mrow><mo> (</mo><mrow><mi>t</mi><mi>a</mi><mi>n</mi><mi>π</mi><mo>+</mo><mfrac><mrow><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mrow><mo>)</mo></mrow></mrow></math></span></p><p><span title="Click to copy mathml"><math><mrow><mo>=</mo><mi>t</mi><mi>a</mi><msup><mrow><mi>n</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mrow><mo> (</mo><mrow><mi>t</mi><mi>a</mi><mi>n</mi><mfrac><mrow><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mrow><mo>)</mo></mrow></mrow></math></span> { Ø tan (<span title="Click to copy mathml"><math><mrow><mfrac><mrow><mi>π</mi></mrow></mfrac></mrow></math></span>+ Ø ) = tan Ø as tan b (+) we in 3rd quadrant)}</p><p><span title="Click to copy mathml"><math><mrow><mo>=</mo><mfrac><mrow><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mrow></math></span> ∈<span title="Click to copy mathml"><math><mrow><mrow><mo> (</mo><mrow><mfrac><mrow><mo>−</mo><mi>π</mi></mrow><mrow><mn>2</mn></mrow></mfrac><mo>, </mo><mfrac><mrow><mi>π</mi></mrow><mrow><mn>2</mn></mrow></mfrac></mrow><mo>)</mo></mrow></mrow></math></span></p>
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