What is the purpose of making graph functions for sin, cos, and tangent?
x-axis could be radians or it could be degrees, and exasperatingly, they might find another measure for use with angles and then it could be that too…. When we graph sin, cos or tan, we show that they are period. If you build a circle and you go 360 degrees, you find your self back where you started. If you move 360 degrees along a graph of amplitude vs. position, where position is a function of sin, cos or tan, you get the value you had before you moved 360 degrees. We could rewrite the above saying 2pi radians instead of 360 degrees. If you want to memorize it: When graphing from zero, cos theta starts at 1 and is moving downward (as theta increases). When graphing from zero, sin theta starts at 0 and moves upward (as theta increases). The difference between graphs of sin theta and cos theta is a phase shift.
