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**paradise737** In this assignment of mine, I'm given an isosceles triangle with sides A, B, and C and <ACB = 90 degrees.

It's an isoceles triangle, so the other two angles are 45 degrees each. But then the problem says "Find the exact values of sin A, cos A, and tan A, based on geometric principles; do not use a calculator."

How do I go about answering this? According to my calculator, sin(45) and cos(45) = .707, while tan(45) = 1--great, so now what? How would I go about figuring that out without a calculator...?