Use a calculator to determine whether each statement is true or false. A true statement may lead to results that differ in the last decimal place due to rounding error. cos 40° = 2 cos 20°

Hello, everyone. We are asked to identify if the given statement is true or false. Using a calculator. We are given the cosine of 72 degrees equals two multiplied by the cosine of 36 degrees. Our answer choices are a true B false. So first make sure your calculator is in degree mode because if it's in radiant mode, you will get a different answer. Next, I'm gonna find what is the cosine of 72 degrees. And I found that it is 0.3090. So for this to be true, this needs to equal two multiplied by the cosine of degrees. And I'm gonna type that in a calculator just as two multiplied by the cosine of degrees. And that comes out as 1.6180. Well, 0.3090 and 1.6180 do not equal each other. So this is answer choice B false. Have a nice day.

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Use a calculator to determine whether each statement is true or false. A true statement may lead to results that differ in the last decimal place due to rounding error. cos 40° = 2 cos 20°