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Prove in any triangle ABC that (i)("ta...

Prove in any `triangle` ABC that
(i)`("tan"C)/("tan"A)=(b^(2)+c^2 -a^2)/(a^(2)+b^2 -c^2)`
`b^(2) "sin"2C+c^(2) "sin"2B= 2bc sin A`.

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