Question

Given a2 + b2 = 1, c2 + d2 = 1, p2 + q2 = 1,
where all numbers are real, then
(1) ab + cd + pq = 1 (2) ab + cd + pq < 3
(3) ab + cd + pq 2 3
(4) ab + cd + pq < 3/2​

Answer 1

Answer:

ab + cd + pq = 1 (2) ab + cd + pq < 3

here is your answer