$\left(\frac{6}{7y}\right)\left(\frac{4y}{5}\right)^2$
$\cos\left(35^{\circ}\right)\:\sec\left(35^{\circ}\right)$
$4xy+3xy+5xy+xy$
$2t\left(5t+1\right)^2$
$\frac{\left(4x^3+6y^2+14\right)}{\left(2y+4\right)}$
$3m-6mn+4m-8n$
$=-4\cos\left(x\right)+\sin^2\left(x\right)-4$
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