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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 9

  • question_answer
    The value of \[\left( 1+\cos \frac{\pi }{9} \right)\left( 1+\cos \frac{3\pi }{9} \right)\left( 1+\cos \frac{5\pi }{9} \right)\]\[\left( 1+\cos \frac{7\pi }{9} \right)\]is______.

    Answer:

    9/16


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