$\frac{1}{sec\left(y\right)+tang\left(y\right)}=sec\left(y\right)-tang\left(y\right)$
$-0.5x\le7.5$
$a^2dx=x\sqrt{x^2-a^2dy}$
$2^{5^{x-3}}=2^{25^x}$
$\frac{\sqrt[4]{x^3}}{\frac{1}{x^{12}}}$
$3-5z+4z$
$\frac{3a^2-3^2}{2a+2}$
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