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Math Help - TI-89 Differentiation and Integration (errors)

  1. #1
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    TI-89 Differentiation and Integration (errors)

    I occasionally get unorthodox answers for differentiation and integration on the TI-89.

    For instance, if I differentiate tan(x) in terms of x I get: pi/180(cos(x))^2

    Anyone know how to fix this? For the exact/approximate option I've got "auto" selected.
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  2. #2
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    Quote Originally Posted by Chizum View Post
    I occasionally get unorthodox answers for differentiation and integration on the TI-89.

    For instance, if I differentiate tan(x) in terms of x I get: pi/180(cos(x))^2

    Anyone know how to fix this? For the exact/approximate option I've got "auto" selected.
    Your calculator needs to be in radian mode.
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