$\left(-xy\right)\cdot\left(-4ax^3\right)$
$9y^2-49$
$\sin4a=4\sin a\cdot\cos a\cdot\cos2a$
$\tan\left(x\right)+\cot\left(x\right)=\frac{2}{\sin^2x}$
$4 ^ { y + 1 } \cdot 4 ^ { 1 - x }$
$+9+5-4+6-8-1-3-7$
$\left(9x-4\right)^3$
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