Example

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

Question

$$\int\frac{arctg^{2}x}{1+x^{2}}dx; \int \sin^{3}x\ \cos^{4}xdx$$

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