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+2ac cdot` Then (a) the triangle is isosceles (b) the triangle is obtuse (c) `B=cos^(-1)(7/8)` (d) `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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The correct Answer is:

A, C, D

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