How to evaluate for cos when given the value of sine with a right triangle

The video tutorial explains the importance of constraints in trigonometry, focusing on how they determine the position of triangles on the unit circle. It discusses where tangent is positive and how to graph sine with given constraints. The tutorial also covers calculating the cosine of Theta using the Pythagorean theorem, emphasizing the significance of understanding positive and negative values in different quadrants.

What is the significance of identifying the constraint in trigonometric problems?

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Explain why tangent is positive in the first and second quadrants.

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What does the constraint tell us about the possible quadrants for the triangle in this context?

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How do you determine the cosine of Theta using the Pythagorean theorem?

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Why is the cosine of Theta determined to be positive sqrt 15 in this scenario?

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