Example

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

Question

$$\quad \int _ { 0 } ^ { \frac { \pi } { 4 } } \tan ^ { 4 } x \sec ^ { 2 } x d x$$

Evaluate

$\frac{1}{5}=0.2$

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