$\sin^2\left(x\right)-2\sin\left(x\right)=-1$
$\sin a\:\left(1+cot\:a\right)=\sin a\:+\:cos\:a$
$18a^2b^2+48abcd+32c^2d\cdot2$
$\frac{8}{1}^{-4}$
$3x+2y=4$
$13.5-73+95.11$
$\lim_{x\to0}\left(\frac{1}{sen\left(x\right)\sqrt{x\cdot sen\left(x\right)}}-\frac{1}{x\sqrt{x\cdot sen\left(x\right)}}\right)$
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