int cos ec^(6)xdx is equal to .............

`int cos ec^(6)xdx` is equal to ................
1) `-cot x-(cot^(5)x)/(5)-(2cot^(3)x)/(3)+k`
2) `-(cot x)/(3)+(2cot^(5)x)/(5)+2cot^(-3)x+k`
3) `(tan^(3)x)/(3)-(tan x)/(5)+2tan^(3)x+k`
4) `(tan^(3)x)/(3)-(tan x)/(5)+3tan^(3)x+k`

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