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March 26, 2017

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(sec 8 x - 1)/(sec 4x -1) = tan 8x/tan 4x Prove it!

  • trig - ,

    One of the first things I usually do is test if the identity is true by picking any value of x.
    Since it is an identity it should work for all value of x
    let x=10
    LS = (1/cos80 -1)/(1/cos40-1)
    = appr 15.58

    RS = tan80/tan40 = appr 6.758

    so , not true, no point trying to prove it.

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