$-4x+8=0$
$\cot\left(x\right)-\tan\left(x\right)=\frac{4\cos^2\left(x\right)-2}{\sin2\left(x\right)}$
$25m^2-81$
$\left(7^4\right)^{28}$
$1977-13$
$\int-\sqrt{36x^2+4}dx$
$\int\:\frac{x^3+x^2+2x+1}{x^4+3x^2+2}dx$
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