How to calculate a vector = 8 B vector = 7 a vector minus B vector?

How to calculate a vector = 8 B vector = 7 a vector minus B vector?

If you want to calculate the "a + B | a + B | a + B | you also need to know if: = π / 3, then: a · B = 28 [a] a + B [b] a + B | ^ 2 = |a [a] a = 28 [a + a + B [b] directly add the corresponding coordinates directly to add the corresponding coordinates, you can be [a [a] a = 8, B [b | = 7, you need to calculate [a + B | a + B | you also know if you want to know if: = π / 3 = π / 3, if = π / 3, then: a = 13 [a + B [a] a-a-a-b [A-B | A-B [A-B [A-B A-B | =