If costheta=1/2(a+1/a)\ t h e n\ cos 3th...

If `costheta=1/2(a+1/a)\ t h e n\ cos 3theta` in term of `' a^(prime)=` a.`1/4(a^3 1/(a^3))` b. `4\ (a^3+1/(a^3))` c.`1/2(a^3(1/(a^3))` d. none

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