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    cotA - tanA = 2cot2A

    RHS: 2 / tan2A

    2 / 2tanA/1 - tan^2A

    2(1-tan^2A) / 2tanA

    1 - tan^2A / tan A

    now what? x - y / z can't be split
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    (Original post by rae)
    cotA - tanA = 2cot2A

    RHS: 2 / tan2A

    2 / 2tanA/1 - tan^2A

    2(1-tan^2A) / 2tanA

    1 - tan^2A / tan A

    now what? x - y / z can't be split
    (x-y)/z = x/z - y/z? How do you think you add and take away fractions?
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    1 - tan^2A / tan A = 1/tanA - tan²A/tanA
    => cotA - tanA
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    thats what ive got in my notes, but i put numbers in (like one and two, nothing hard!) and was convinced it didnt work!

    oh my god, this is ill fated...
 
 
 
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