Desarrolla $\left(0$ left $\left(-2x-3y$ \ $1gnt\right)$ $21\right)\left(-2x-3y^{2}\right)$

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$a\right)$ $\int 8x^{3}cot\left(3x^{4}-1\right)dx=$ $b\right)$ $\int 12xSec\left(6x^{2}+2Mx=$ $c\right)$ $\int 12x^{2}Sec^{2}\left(2x^{3}+6\right)dx=$ $d\right)$ $\int 8xCsc\left(2x^{2}+5\right)Cot\left(2x^{2}+5\right)dx=$ = e) $\int 42x^{2}cos\left(6x^{3}+1\right)dx=$