Unit: Trigonometric functions: possible incorrect answer

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Mum

January 07, 2021 00:50

Some "Modeling with sinusoidal functions: phase shift" questions have an incorrect answer in the practice section of the Unit: Trigonometric functions HS Trig

I think one was a question about Pluto:

D(22) = -1.5cos(2pi(t+11)/248) +5.9 = 4.89 approx.

I think the answer should be:

D(22) = 4.40

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Regina Litman

January 07, 2021 03:14
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Whenever you are doing a trigonometric problem, make sure you are calculating with the correct unit of angle measure. I'm guessing that the problem you are working with requires the use of radians, not degrees. If you used degrees to come up with the answer, try again with radians.
Mum

January 08, 2021 01:34

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Massive light bulb moment! Thank you ever so much for taking the time to reply.

Apologies, I've just realised I needed to scroll down on the Unit to find the correct place to put this question. Been away a while and navigation skills not the best!

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Unit: Trigonometric functions: possible incorrect answer

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