In-any-ABC-the-value-of-2ac-sin-A-B-C-2-is-

Question Number 21430 by Tinkutara last updated on 23/Sep/17

In any Δ A B C, the value of

2 a c \sin (\frac{A - B + C}{2}) is

Answered by $@ty@m last updated on 23/Sep/17

= 2 a c \sin (\frac{π - 2 B}{2})

= 2 a c \cos B

= c^{2} + a^{2} - b^{2}

Commented by Tinkutara last updated on 23/Sep/17

But book says b^{2} - a^{2} - c^{2} . I also think

your answer true because I also got the

same answer .