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The sides of a triangle are in AP. If th...

The sides of a triangle are in AP. If the angles A and C are the greatest and smallest angle respectively, then `4 (1- cos A) (1-cos C)` is equal to

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The correct Answer is:
`=2 cos ""(A+C)/(2). cos ""(A+C)/(2)=4 cos ^(2) ""(A+C)/(2)`
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