$\:43\:+\:\left(-15\right)\:-\:\left(-102\right)\:$
$sen\:a\:+3sen\:b\:-\:12sen\:a$
$2\sin\left(t\right)\left(-\sin\left(t\right)\right)+4\cos\left(t\right)$
$2t^4+2t^2$
$x^2-6x+5<0$
$100y^4-49z^2$
$4n^2+-5n+-1.\:3n^2$
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