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\cos^{2} (60 ° + A) + \cos^{2} (60 ° - A)

এর মান -

1 - \frac{1}{2} \cos 2 A

1 + \sin 2 A

1 +3 cos2A

1 + \frac{1}{2} \cos 2 A

ANS : 1

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