$$4-2(\cot^{2}30+\sin^{2}45^{\prime})$$
$2\left(-\left(\cot(30)\right)^{2}+2\right)$
$$2\left(2-\left(\left(\cot(30)\right)^{2}+\left(\sin(\frac{\mathrm{d}}{\mathrm{d}x}(45))\right)^{2}\right)\right)$$
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$2\left(-\left(\cot(30)\right)^{2}+2\right)\approx 3.951253121$
