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How to use special right triangles to evaluate for cosine of 45 degrees

👉 Learn how to evaluate trigonometric functions using the special right triangles. A right triangle is a triangle with 90 degrees as one of its angles. A special right triangle is a right triangle with the angles 30, 60, 90 degrees or 45, 45, 90 degrees. To evaluate the trigonometric function of special right triangles, we first note the ...

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