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Expansion of (x-y)^2

If a^2+b^2=23...

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{ If }a^2+b^2=23ab(a,b>0), then }A.M. of }\operatorname{ln}a}{ and }\operatorname{ln}b is equal to

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a^{2} + b^{2} = 23 a b (a, b > 0)

, then A.M. of Ina and lnb is equal to

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}}

△ A B C

\frac{a}{b^{2} - c^{2}} + \frac{c}{b^{2} - a^{2}} = 0

B

{4 x}^{2} - 4 a x + (a^{2} - b^{2}) = 0

(a, b \in R)

x

sin A = a cos B

cos A = b sin B

(a^{2} - 1) {tan}^{2} A + (1 - b^{2}) {tan}^{2} B

(\frac{a^{2} - b^{2}}{b^{2}}) .

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