1. Crippled, Disabled
Crippled is almost sound like a discriminating word and have a negative connotation where as disabled is more polished and reverent.
2. Relaxed, Easy-going
Both seem same but relaxed refers to free, pleasure and stress free but easy-going implies not serious and laziness.
3. Knockout, Beautiful
Knockout mainly used to imply someone is sex y where as beautiful is simple compliment for a person.
4. Young, Immature
Sometimes both are used in the same context but youth may be always a substitute for immature.
5. Skinny, Thi n Both are almost similar but actually someone skinny is called thin.
Answer:

Step-by-step explanation:
observe
||a–b+c|| = ||a+b+c||
(a-b+c)² = (a+b+c)²
(a+b+c)² – (a-b+c)² = 0
((a+b+c)+(a-b+c))((a+b+c)–(a-b+c)) = 0
(2a+2c)(2b) = 0
(a+c)b = 0
a•b + c•b = 0
||a||×||b||×cos(π/8) + ||c||×||b||×cos(θ) = 0
