How to define the tangent function for all angles.
Examine the United States' development as a diplomatic and military power in the world.
Trace the United States' growing diplomatic and military power into the 20th Century.
How to use dimensional analysis to convert units in chemistry problems.
How to solve a sine equation by factoring: 4 [sin(theta)]^2 = 2.
How to derive the cosine of a difference formula.
How to write the parametric equations of a circle centered at (0,0) with radius r, oriented counter-clockwise.
How do we measure sine and cosine of pi/4?
How to evaluate expressions like tan(sin (4/5))^(-1).
How to measure the sine and cosine of 150.