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