In a triangle angleA=55^(@),angleB=15^(@...

In a triangle `angleA=55^(@),angleB=15^(@),angleC=110^(@)`. Then `c^(2)-a^(2)` is equal to

A

(a) `ab`

B

(b) `2ab`

C

(c) `-ab`

D

(d) `a^(2)b`

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The correct Answer is:

A

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