$\frac{1-\cos\left(x\right)}{\sin\left(x\right)}-\frac{\sec\left(x\right)}{1-cos\left(x\right)}=2\csc\left(x\right)$
$\int29cos^3\left(66x\right)dx$
$\:\left(\:24:\:2\:\right)\::12\:.\:6$
$3u^2-90u+111=0$
$2x^2+8x-7=-2$
$3x+\frac{54}{2x+3}=18$
$\int2x^3\sin\left(4x\right)dx$
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