Evaluate cos(-1.9967)

Problem

cos(−1.9967)

Solution

1. Identify the property of the cosine function regarding negative angles. Since cosine is an even function, cos(−θ)=cos(θ)

2. Apply the property to the given value to simplify the expression.

cos(−1.9967)=cos(1.9967)

3. Calculate the value using a calculator set to radian mode, as the input is a real number without a degree symbol.

cos(1.9967)≈−0.4121

Final Answer

cos(−1.9967)=−0.4121

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