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In a Delta ABC if angleA = 90^(@), the C...

In a `Delta ABC` if `angleA = 90^(@)`, the `Cos^(-1)((R )/(r_(2) + r_(3)))` is equal to

A

`90^(@)`

B

`30^(@)`

C

`60^(@)`

D

`45^(@)`

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The correct Answer is:
C
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