Choose the correct simplification of the expression c2 ⋅ c9. c11 c7 c18 c

Factor completely. x^8 - 1/81 a) (x^4 + 1/9)(x^2 + 1/3)(x^2 - 1/3) b) (x^4 - 1/9)(x^2 + 1/3)(x^2 - 1/3) c) (x^4 + 1/9)(x^2 - 1/3)2

Will mark brainliest question in the pic.

See attachment below and find the equivalent of tan(∠qsr)