$2.36\:-10.58$
$\frac{1-\cos\beta}{\sin\beta}=\frac{\sin\beta}{1+\cos\beta}$
$\left(-21\right)\cdot\left(-48\right)$
$4\:+\:\left(-6\right)\:-\:4\:+\:\left(-8\right)\:-\:\left(-7\right)\:+\:\left(-11\right)\:+\:4\:-\:\left(-5\right)\:+\:\left(4\right)\:-\:\left(-3\right)\:+\:4\:-\:11$
$\left(-10x^2-10x+3\right)-\left(-4x^2-x\right)$
$.5m+.25=\frac{1}{2}$
$2 x ^ { 3 } + 3 x ^ { 2 } - 1$
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