$\cos4x-1=0$
$-2\ln\left(y\right)+c=x+c$
$\cos4t\:\cos6t$
$2-\frac{1}{x^2+x}=\frac{3}{x+1}$
$\left(7a-10b\right)+\left(8b+5a\right)-\left(+b-3d+a\right)=0$
$1+\frac{2-2\cos\left(x\right)}{\sin\left(x\right)+\cos\left(x\right)+1}$
$1-\cos\left(0.45\right)^2$
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