(4+b)(b+4)\left(4+b\right)\left(b+4\right)(4+b)(b+4)
−x−y+3x−5y-x-y+3x-5y−x−y+3x−5y
sin(x+y)+sin(x−y)=sin(x−y)\sin\left(x+y\right)+\sin\left(x-y\right)=\sin\left(x-y\right)sin(x+y)+sin(x−y)=sin(x−y)
∫(x+1)(x+1)2+1dx\int\left(x+1\right)\sqrt{\left(x+1\right)^2+1}dx∫(x+1)(x+1)2+1dx
12x2−6−6x12x^2-6-6x12x2−6−6x
y2−3y=9y^2-3y=9y2−3y=9
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