Use the difference formula for tangent to simplify the expression. The formula states that <math><mstyle displaystyle="true"><mi>tan</mi><mrow><mo>(</mo><mi>A</mi><mo>-</mo><mi>B</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mrow><mi>tan</mi><mrow><mo>(</mo><mi>A</mi><mo>)</mo></mrow><mo>-</mo><mi>tan</mi><mrow><mo>(</mo><mi>B</mi><mo>)</mo></mrow></mrow><mrow><mn>1</mn><mo>+</mo><mi>tan</mi><mrow><mo>(</mo><mi>A</mi><mo>)</mo></mrow><mi>tan</mi><mrow><mo>(</mo><mi>B</mi><mo>)</mo></mrow></mrow></mfrac></mstyle></math> .

Remove parentheses.

Rewrite <math><mstyle displaystyle="true"><mi>tan</mi><mrow><mo>(</mo><mn>90</mn><mi>°</mi><mo>)</mo></mrow></mstyle></math> in terms of sines and cosines.

The exact value of <math><mstyle displaystyle="true"><mi>cos</mi><mrow><mo>(</mo><mn>90</mn><mi>°</mi><mo>)</mo></mrow></mstyle></math> is <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> .

The expression contains a division by <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> . The expression is undefined.

Undefined

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