$3+4-\left[-5+7+\left(4-3\right)-4\right]$
$+3+9-5-2+1$
$\sin^2x=3\sin x-2$
$\frac{2}{5}xy^2.\:\frac{7}{10}x^3y$
$\frac{\sin\left(x\right)+\cos\left(x\right)+\tan\left(x\right)}{\cos\left(x\right)}$
$143.75\:=\:5.5+3.5x$
$sin2x+sinx+2cosx+1$
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