$\cos\left(b+45^{\circ}\right)\sin\left(b+45^{\circ}\right)=\cos^2\left(b\right)-\frac{1}{2}$
$2x-1=x+4$
$6g+20\:=\:2g+36$
$\lim_{x\to\infty}\left(\frac{2x-3}{2x-6}\right)^{3x+1}$
$-2x^2+2x+5$
$\frac{1-2cos^2x+cos^4x}{sin^2x}$
$-x=-13$
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