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Egwald Mathematics: Trigonometry
by
Elmer G. Wiens
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Natural trig functions | Inverse trig functions
Natural and Reciprocal Trigonometric Functions
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alpha = the angle between the x-axis and the ray from the origin to the point P.
z = sin(alpha) = y / r z = csc(alpha) = r / y
z = cos(alpha) = x / r z = sec(alpha) = r / x
z = tan(alpha) = y / x z = cot(alpha) = x / y
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