How to send the email to the vendors and in what format.
Find the included angle between the two planes 2x+y+2z-4=0 and x+y+5=0
Find the included angle between the two planes 2x+y+2z-4=0 and x+y+5=0
prove that if x and y are odd positive integers then x^2+y^2 is even but not divisible by 4