$a-b;\:\:a+b=8;\:a^2-b^2=32$
$-50-78-100$
$\int3cos\:\left(5x+1\right)dx$
$48,63-38,91$
$2a^2+11a-21=0$
$2a^2-8ab+b;\:a=3;b=-b$
$9-9y^8$
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