SOLUTION: The CAST Rule describes for a quadrant which ratios have positive values. Describe why the tangent ratio is positive only in quadrants I and III.

Question 1173744: The CAST Rule describes for a quadrant which ratios have positive values. Describe why the tangent ratio is positive only in quadrants I and III.
Found 2 solutions by greenestamps, ikleyn:
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

I can only guess what the CAST rule is....

Tangent is the ratio of sine and cosine; it is positive if both sine and cosine are positive (quadrant I) or if they are both negative (quadrant III).

Answer by ikleyn(52790) (Show Source): You can put this solution on YOUR website!
.

About the CAST rule, see this web-site

http://mathonline.wikidot.com/cast-rule

and find there nice explanations to everything you need.

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