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\cos^{2} 25 ° + \cos^{2} 35^{°} + \cos^{2} 45 ° + \cos^{2} 55 ° + \cos^{2} 65 ° এ র ম া ন -

\frac{5}{2}

\frac{2}{5}

\frac{1}{5}

ANS : 1

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