Find the Value of Theta in Degrees and Radians in First Quadrant

The video tutorial explains how to find the angle Theta in the first quadrant where the cosine equals sqrt 2 / 2. It begins by introducing the problem and constructing the first quadrant of the unit circle. The cosine of an angle is explained as the X coordinate on the unit circle. The tutorial then demonstrates how to find the angle by identifying when the X coordinate equals sqrt 2 / 2, concluding that the angle is 45 degrees or π/4 radians.

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