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how can the value of tan30 be found?

  • math -

    ou need to know first of all that tanx=sinx/cosx

    You will also need to know that:
    sin 90 =1

    cos 45=sqrt[2]/2

    so you can recognize that 1/sqrt[3] corresponds to tan30, since tan30=sin30/cos30
    =1/2/sqrt[3]/2 = 1/sqrt[3]

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