$sec\left(b\right)+\sec\left(b\right)\cdot cot^2\left(b\right)=\frac{1}{cos\left(b\right)-\cos^2\left(b\right)}$
$x^2-121y^2$
$\frac{dx}{dy}-x=y^3$
$\frac{sin\left(x\right)+tan\left(x\right)}{cot\left(x\right)+csc\left(x\right)}$
$\lim_{h\to0}\left(\frac{\left(4+h\right)^3-64}{h}\right)$
$\int_5^{15}\left(2t+60\right)dx$
$8a^3-36^2b+54ab^2-27b^3$
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