1.

int(sec^(4)x+tan^(4)x)dx=

Answer»

`2/3tan^(3)x-2/3tanx+x+C`
`1/3sec^(2)xtanx+5/3tanx+(tan^(3)x)/3+x+c`
`2/3tan^(3)x+x+c`
`1/3sec^(2)xtanx-5/3tanx+(tan^(3)x)/3+x+c`

ANSWER :C


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