How to use the power reduction formulas to derive the half-angle formulas.
How to evaluate expressions like tan(sin (4/5))^(-1).
How to define the sine ratio and identify the sine of an angle in a right triangle.
How to define the cosine ratio and identify the cosine of an angle in a right triangle.
How to define the tangent ratio and identify the tangent of an angle in a right triangle.
How to use inverse trig functions to find angles in right triangles.
How to find the vertical asymptotes of secant, cosecant, and cotangent.
How radioactive elements change their identities through transmutation.
How to define the properties of real numbers.
How to raise a complex number to an integer power using DeMoivre's Theorem.