$\frac{243}{16}\int\left(cot^4\left(x\right)csc^2\left(x\right)\right)dx$
$6y=3x^2$
$9a^2-12ab4b^2$
$2b^2\sin^2\left(x\right)dx=dy$
$12+3x<60$
$\frac{dx}{dy}=3xy^3$
$\:\:5x\:^2\:\:x\::\:1$
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