The value of 8 cos^3 (pie/9) - 6 cos ( pie/9)
option:
A) 1
B) -1
C) 0
D) none of the above
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1
8cos³(π/9) - 6cos(π/9)
=> 2cos(π/9)[4cos² - 3]
=> 2cos(π/9)[cos² + 3cos² - 3]
=> 2cos(π/9)[cos² + 3sin²]
Thus, the answer would be none of the above.
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