Thread: Sine

Originally Posted by ADY

How can there be two answers then? because of where the curve crosses the x axis?

Sine is positive in the first and second quadrants.

The solution the calculator gives you for is the angle in the first quadrant.

To find the angle in the second quadrant, subtract what you have found from .

For the function: y = sin (x) the graph crosses the x axis 3 times from 0 to
= 360 degrees

For y = sin (x) - .6 the graphs shifts down .6 which makes decreases the area above the x axis and increases the area below the x axis and in turn changes where it intersects the x axis. Look at the attached graph and see if it helps.

Molly:

What an excellent reply, that has really helped a lot!

Thank you so much!



Ady