Value of 8cos3 -9-6cos-9

The correct option is B 1 8 cos^3 π9 6cosπ9 =2(4cos^3 π9 3cosπ9) =2cos ( 3 ×π9) #160; .............. ∴cos 3A=( 4cos ^ 3 A 3cos A ) ...

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General Solution of Trigonometric Equation

Value of 8c...

Question

Value of $8 {cos}^{3} \frac{π}{9} - 6 cos \frac{π}{9}$

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8 {cos}^{3} \frac{π}{9} - 6 cos \frac{π}{9}

9^{1 / 3} \times 9^{1 / 9} \times 9^{1 / 27} \times . . . . . \infty

9^{\frac{1}{3}} {.9}^{\frac{1}{9}} {.9}^{\frac{1}{27}} . . . . . . . . . . .

\infty

{cos}^{3} \frac{π}{8} cos \frac{3 π}{8} + {sin}^{3} \frac{π}{8} sin \frac{3 π}{8}

{⎛ ⎝ \frac{1 + sin \frac{2 π}{9} + i cos \frac{2 π}{9}}{1 + sin \frac{2 π}{9} - i cos \frac{2 π}{9}} ⎞ ⎠}^{3}

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