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If in a DeltaABC,a^(2)cos^(2)A-b^(2)-c^(...

If in a `DeltaABC,a^(2)cos^(2)A-b^(2)-c^(2)=0`, then

A

`(pi)/(4)ltAlt(pi)/(2)`

B

`(pi)/(2)ltAltpi`

C

`A=(pi)/(2)`

D

`Alt(pi)/(4)`

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The correct Answer is:
B
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