[" If "cos theta=(1)/(2)(a+(1)/(a))" the...

[" If "cos theta=(1)/(2)(a+(1)/(a))" then "cos3 theta" in terms of "a'=],[[" (a) "(1)/(4)(a^(3)+(1)/(a^(3)))," (b) "(1)/(2)(a^(3)+(1)/(a^(3)))," (c) "4(a^(3)+(1)/(a^(3)))" (d) none "]]

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