$5x-2y=1$
$3.77\cdot0.375$
$\int3edx$
$\cos^2a-\sin^2a=-1$
$\left(6.3\cdot10^{-12}\right)\left(9.0\cdot10^9\right)$
$\int\left(sec^2x-1\right)sec\left(x\right)\:tan\left(x\right)dx$
$4ax-9b+3a-12bx$
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