$\left(5w^5-6\right)\left(5w^5+6\right)-\left(5w^5-6\right)^2$
$9d^2-d^2$
$7+b+b+6a+2a+1$
$a^6-6a^3-7$
$a+b+2\:a+b\:-2$
$\frac{\tan a-\cot a}{\tan a+\cot a}=1-2\cos^2a$
$\lim_{x\to0}\left(\frac{5^x}{5^n+7^n}\right)$
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