−15+8−(5)+1−5−(−2)+(−2)-15+8-\left(5\right)+1-5-\left(-2\right)+\left(-2\right)−15+8−(5)+1−5−(−2)+(−2)
2+3 x 22+3\:x\:22+3x2
81−x49−x2\frac{81-x^4}{9-x^2}9−x281−x4
x3+2x2−29x+42x^3+2x^2-29x+42x3+2x2−29x+42
(x2−4y)5\left(\frac{x}{2}-4y\right)^5(2x−4y)5
sen2xsenxsen2xsenxsen2xsenx
5x2(1−2x)5x^2\left(1-2x\right)5x2(1−2x)
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