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$\sin\left(a\right)\cdot\sec\left(c\right)+\sin\left(c\right)\cdot\sec\left(a\right)$
$3x^4\left(4x^{\:3}-5x^2\right)$
$25x^2+x+36$
$cos^4x\:-\:sin^4x$
$-55\:-\:\left(-15\right)$
$i\sqrt{12}\left(i\sqrt{11}-\sqrt{5}\right)$
$sin\left(2x\right)-2sin\left(x\right)+2sin^2\left(\frac{x}{2}\right)=0$
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