7−yy−7\frac{7-y}{y-7}y−77−y
36x4−132x2+12136x^{4}-132x^{2}+12136x4−132x2+121
(t2−1)5\left(t^2-1\right)^5(t2−1)5
3x2+6x+35x2+5x\frac{3x^2+6x+3}{5x^2+5x}5x2+5x3x2+6x+3
2x+2ax+a\frac{2x+2a}{x+a}x+a2x+2a
4(x−5)2−2(x+4)34\left(x-5\right)^2-2\left(x+4\right)^34(x−5)2−2(x+4)3
sen(x)sen(3x) = 3 sen(3x)\:sen\left(x\right)sen\left(3x\right)\:=\:3\:sen\left(3x\right)sen(x)sen(3x)=3sen(3x)
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