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Given a + B = 5, a-c = 4, find the value of (B + C) ^ 2 + 2b-1 + 2C~~~
(a+b)-(a-c)=b+c=5-4=1
（b+c）^2+2b-1+2c
=（b+c）^2+2(b+c)-1
=1^2+2-1
=2
It is known that | a | = | B | = | C | = 1, = π | - 3, = π | - 2, = π | - 4. Simplify {a + 2b-2c} {- 3A + 2B + C}
If a + 2B + 3C = 12 and a * a + b * B + C * C = a * B + b * C + C * a, what is the value of a + b * B + C * C?
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