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If 0 lt alpha, beta lt pi and they satis...

If `0 lt alpha, beta lt pi` and they satisfy `cos alpha + cosbeta - cos(alpha + beta)=3/2`

A

`alpha= beta`

B

`alpha + beta = (2pi)/3`

C

`alpha = 2beta`

D

`beta = 2alpha`

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The correct Answer is:
A, B
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AAKASH INSTITUTE-TRIGNOMETRIC FUNCTIONS -Section-C (Objective Type Questions More than one options are correct )
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