$25x^2+\left(5x\right)\left(4y\right)+4y^2$
$tan\left(3x\right)=5$
$\int_2^{\infty}\left(-\frac{1}{2\cdot x+1}\right)dx$
$2\sin\left(2x\right)+2\sin\left(x\right)=1$
$\frac{165.40112013663091010149580999529}{176.7857142857142}$
$\tan\left(\arccos\left(\frac{x}{2}\right)\right)$
$3\sin\left(x\right)-\cos\left(2x\right)=1$
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