$\int\frac{sin2x}{cos^4x}dx$
$\int x\:sen\:\left(\frac{2x}{5}\right)dx$
$90+15\cdot0+1$
$-0\infty$
$2a^2-\frac{5}{4}a+a-3a^2-6a^2$
$4x^2-3x-1$
$\left(1\right)\left(-3\right)^3$
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