to nswer this you have to get a scientific calculator and multiply the number in the line of a and b times cos and then divide it for example the line a is 4.24 but when you multiply it by cos it is 0.997263104 and b is 3 but when you multiply by cos its 0.998629534, now divide 0.997263104 by 0.998629534 to get 0.998631694...
Hope this helps
