Find a calculator approximation to four decimal places for eac...

Question

Find a calculator approximation to four decimal places for each circular function value. cos (-0.2443)

Accepted Answer

Welcome back everyone. In this problem, we want to determine the value of the trigonometric circular function of the cosine of negative 0.7645 with the help of a calculator. And we want to run our answer to four decimal places for our answer choices. A is negative 0.6922. B is 0.7217 C is negative 0.7217 and D is 0.6922. Now, we want to find the value of our trigonometric function and here we have our calculator to help us. So it means that we're going to put this expression that is the cosine of negative 0.7645 directly into our calculator. Now, one thing to note is that you have to make sure that your calculator is in radiance because this expression, this value for the angle for the cosine is written in radiance. So if you're not sure how to do that in the screen for your calculator, you should see a small, uh a small note that says R ad that means it's in radiance. If not, then you may have to change it from degrees to radiance depending on the calculator that you're using. Now, once it's in radiant mode, you can go ahead and put this expression into your calculator. When you do that, you should find that on your screen, you get the number or the value that's approximately 0.721728535749. So that's probably what you're seeing on your calculator screen right now. We're not done yet because we have to run our answer to four decimal places. So let's do that first. We need to go to the fourth decimal place in our value, which is the digit seven. We look at the number beside it two, that's less than five. So we won't round up. We'll keep it the same. So the four decimal places are expression would be 0.7217. When we look back on our answer choices that would have been answer choice. B thanks a lot for watching everyone. I hope this video helped.

Find a calculator approximation to four decimal places for each circular function value. cos (-0.2443)

Key Concepts

Circular Functions

Angle Measurement in Radians

Calculator Approximation and Rounding

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