Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac { \tan 20 ^ { \circ } } { 1 + \tan 90 ^ { \circ } }$$

Evaluate

$\text{Indeterminate}$

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