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22 July, 19:42

Tan20*tan40 tan60*tan80=3 prove that

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  1. 22 July, 20:06
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    Step-by-step explanation:

    tan (θ) tan (60-θ) tan (60+θ) = tan (3θ)

    tan (20) tan (40) tan (60) tan (80)

    (tan (20) tan (60-20) tan (60+20)) tan (60)

    tan^2 (60)

    (3-√) 2

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