Pls help with the following problems:

Q1:

Find the limit. (Use symbolic notation and fractions where needed. Enter DNE if the limit does not exist.) sin (9xy) lim = (x, y)-(0,0) 3xyLet f : R2 - R and suppose that lim f ( x, y ) = -9. (x,y)-(4,6) What can you say about the value f (4, 6)? If may or may not be continuous at (4, 6). If is continuous at (4, 6). Of (4, 6) # -9 Of (4, 6) =-9 O Nothing can be said about the value f (4, 6).Let r(t) = (sin(t), cos(t), 2 sin(t) + 7 cos(2t)). Find the projection of r(t) onto the xz-plane for 1 S x S 1. (Use symbolic notation and fractions Where needed.) z(x) =