The arithmetic mean of the roots of the equation 4 ^3x-4 ^2x- (315 +x)=1 in the interval (0,315) is equal to

JEE Main Mathematics question

Not in JEE Main syllabus

The arithmetic mean of the roots of the equation in the interval is equal to

Answer: (B)

Since 315 is odd, . The equation becomes . Factorise: \cos^2\cos\cos\cos$

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Question ID VK-008183