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IB Mathematics SL Prep

Category - IB Mathematics

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What is the cotangent of 31.5° to three significant figures?

0.315
0.613
1.632
None of the above

Explanation

Answer: C - The cotangent of 31.5° is 1.632.

Solution (steps taken are dependent on type of scientific calculator used)

Step 1:

Using a calculator in the degree mode, enter 31.5 and press the TAN key.

The tangent of 31.5° is 0.613.

Step 2:

Press the 1/X key to calculate the cotangent.

The cotangent of 31.5 is 1.632.

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