{ 21. If }2a^2+9b^2+4c^2-4a-6b+4ac=-5 , then the }}{ value of }a^2-b^2+c^2 is equal to

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a^{2} + b^{2} - 2 a^{2} + c^{2} + 4 a

△ A B C, a^{4} + b^{4} + c^{4} = 2 a^{2} b^{2} + b^{2} c^{2} + 2 c^{2} a^{2},

sin A

Factors of $a^{2} - b^{2} - 4 a c + 4 c^{2}$ are

$(a - 2 c + b)$ and $(a + 2 c - b)$

a + b + c = 0

\frac{1}{b^{2} + c^{2} - a^{2}} + \frac{1}{c^{2} + a^{2} - b^{2}} + \frac{1}{a^{2} + b^{2} - c^{2}}

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