Changing sign of ratios with increasing angle
In turn, look at each ratio as the value of x and y changes with increasing angle.
If you are not sure about sign division look back here
The results can be summarised in this diagram:
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The Sine Curve
note:
- the sine graph starts at zero
- it repeats itself every 360 degrees
- y is never more than 1 or less than -1
- a sin graph 'leads' a cos graph by 90 degrees
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The Cosine Curve
note:
- the cosine graph starts at one
- it repeats itself every 360 degrees
- y is never more than 1 or less than -1
- a cos graph 'lags' a sin graph by 90 degrees
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The Tangent Curve
note:
- the tangent graph starts at zero
- it repeats itself every 180 degrees
- y can vary between numbers approaching infinity and minus infinity
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