Inverse Trigonometric Functions - Relationships Among The Inverse Trigonometric Functions

Relationships Among The Inverse Trigonometric Functions

Complementary angles:

Negative arguments:

Reciprocal arguments:

If you only have a fragment of a sine table:

Whenever the square root of a complex number is used here, we choose the root with the positive real part (or positive imaginary part if the square was negative real).

From the half-angle formula, we get:

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