The value of cos(–60º) is -1/2. Therefore. option B is the correct answer.
We need to find the exact value of cos(–60º).
What are six different types of trigonometric functions?
There are six functions of an angle commonly used in trigonometry. Their names and abbreviations are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc).
Now, cos (-60º)=-1/2=-0.5
The value of cos(–60º) is -1/2. Therefore. option B is the correct answer.
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