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Math Help - questions on some concepts

  1. #1
    Junior Member
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    questions on some concepts

    I know some equations are true, like

    (sin A)^2 + (cos A)^2 = 1

    sin (90 - A) = cos A

    cos (90 - A) = sin A

    but does these equations have any limitation on the angle A?

    can A be any real angle?

    thanks!
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by kenny1999 View Post
    I know some equations are true, like

    (sin A)^2 + (cos A)^2 = 1

    sin (90 - A) = cos A

    cos (90 - A) = sin A

    but does these equations have any limitation on the angle A?

    can A be any real angle?

    thanks!
    I wouldn't be true if it was not applicable to all real values of A.
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