$\lim_{x\to0}\frac{3x}{\sin\left(3x\right)}$
$2b+4d;\:b=2;\:d=3$
$\int-4x\left(-4x-4\right)^{-2}dx$
$x^2+3x+2.25$
$\frac{\sin\left(x\right)}{\frac{\cos\left(x\right)}{\sin\left(x\right)}-\csc\left(x\right)}$
$\left(z-5\right)\left(z+4\right)$
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