$\left(1-\sin^2x\right).\csc^2x=1$
$\csc\left(x\right)-\tan\left(x\right)\cos\left(x\right)$
$g+g$
$y^2-25w^2$
$\left(\sin u+\cos u\right)^2+\left(\sin u-\cos u\right)^2$
$76+224e^{-0.06t}$
$7x+4-5x-8$
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