trig math

Prove that tan(theta)tan(60+theta)=tan3theta

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  1. The identity is not true,
    All I need is one counterexample.
    let x=10°
    LS = tan10° tan 70° = .48445
    RS = tan 30 = .577
    LS ≠ RS
    we don't have an identity

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    posted by Reiny

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