sqrt((81*cos((-1/4))^4)*sin((-1/4))^2 + (81*sin((-1/4))^4)*cos((-1/4))^2 + 9)
sqrt((81*cos(-1/4)^4)*sin(-1/4)^2 + (81*sin(-1/4)^4)*cos(-1/4)^2 + 9)
sqrt(9 + 81*cos(1/4)^2*sin(1/4)^4 + 81*cos(1/4)^4*sin(1/4)^2)
(9.0 + 81.0*cos(x)^2*sin(x)^4 + 81.0*cos(x)^4*sin(x)^2)^0.5
___________________________
/ 4 2
3*/ 1 – 9*sin (x) + 9*sin (x)
___________________________________________
/ 2 4 4 2
3*/ 1 + 9*cos (x)*sin (x) + 9*cos (x)*sin (x)
_______________________
/ 81*(1 – cos(4*x))
/ 9 + —————–
/ 8
___________________________________________
/ 2 4 4 2
3*/ 1 + 9*cos (x)*sin (x) + 9*cos (x)*sin (x)
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/ 2 4 4 2
/ 9 + 81*cos (x)*sin (x) + 81*cos (x)*sin (x)