(x2+a2)2\left(x^2+a^2\right)^2(x2+a2)2
4n2−494n^2-494n2−49
∫0∞4e7xdx\int_0^{\infty}4e^{7x}dx∫0∞4e7xdx
25a6+20a3n+4n225a^6+20a^3n+4n^225a6+20a3n+4n2
7−3⋅47-3\cdot47−3⋅4
∫97y4dy\int\frac{9}{7}y^{4}dy∫79y4dy
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