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" (ख) सिद्ध कीजिए कि- "cos3x=4cos^(3)x-3...

" (ख) सिद्ध कीजिए कि- "cos3x=4cos^(3)x-3cos x

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Smallest positive x satisfying the equation cos^(3) 3x + cos^(3) 5x = 8 cos^(3) 4x * cos^(3) x is :

Smallest positive x satisfying the equation cos^(3) 3x + cos^(3) 5x = 8 cos^(3) 4x * cos^(3) x is :

Smallest positive x satisfying the equation cos^(3) 3x + cos^(3) 5x = 8 cos^(3) 4x * cos^(3) x is :