Example

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

Question

$$\displaystyle\int_{ 0 }^{ \pi } \frac{ \sin x }{ \cos x } d x$$

Evaluate

$0$

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