$h-15>10$
$\cot\left(a\right)=\cos\left(a\right)\sin\left(a\right)+\cos^3\left(a\right)\csc\left(a\right)$
$5\cdot8\cdot6$
$\cos\left(x\right)-\cos\left(3x\right)=0$
$\left(5a^2-3\right)\left(5a^3+3\right)$
$36^2b^2-81c^4$
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