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The sides of A B C satisfy the equation...

The sides of ` A B C` satisfy the equation `2a^2+4b^2+c^2=4a b+2a cdot` Then the triangle is isosceles the triangle is obtuse `B=cos^(-1)(7/8)` `A=cos^(-1)(1/4)`

A

the triangle is isosceles

B

the triangle is obtuse

C

`B=cos ^(-1)((7)/(8))`

D

`A =cos ^(-1) ((1)/(4))`

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A, C, D
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