What is the exact value of cos(30 degrees)?
Answer and explanation
Correct answer: D. sqrt(3)/2
- Step 1: Use the special right triangles for 30 degrees.
- Step 2: cos(30 degrees) = sqrt(3)/2.
Answer
sqrt(3)/2.
Why not the others: These are the exact values of other standard angle-function pairs; check which side ratio defines the function.
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