The CAST Rule says that in quadrant I all three of sinθ, sin θ , cosθ, cos θ , tanθ tan θ are positive. In quadrant II, only sinθ ... |
You can use these rules to find sin, cos and tan of any positive or negative angle using the corresponding cute angle made with the x-axis, θ. sin sin θ. |
What this tells us is that if we have a triangle in quadrant one, sine, cosine and tangent will all be positive. In quadrant two, only sine will be positive ... |
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