Y mul div c c mul pow add x1 mul x3 cos x3 c mul pow cos mul add pow add c pow x1 c c mul c pow add x1 mul x3 cos x3 c tan x3 div c c mul add mul c cos x3 mul x3 sin x3 mul sin mul add pow add c pow x1 c c mul c pow add x1 mul x3 cos x3 c tan x3 tan x3