$b\left(t\right)\:=\:7.5\:+\:10.5\:sin\left(\frac{2\pi}{63}0\right)$
$5a^26y-7$
$-d-7d$
$745+714$
$x^4+16x^2y^2+64y^4$
$\frac{16-4a^2}{4-2a}$
$a^2+b^2-2ab\:.\:a-b$
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