Evaluate -cos(pi)

Problem

−cos(π)

Solution

1. Identify the value of the cosine function at the angle π radians on the unit circle.

2. Recall that the coordinates on the unit circle are given by (cos(θ),sin(θ)) At θ=π the point is (−1,0)

3. Substitute the value cos(π)=−1 into the original expression.

4. Simplify the resulting expression by applying the double negative.

Final Answer

−cos(π)=1

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