Question: I have no idea why is it wrong ffThe relation cos 3t = 4 cost - 3 cost that was derived in the video expresses

I have no idea why is it wrong

\f\fThe relation cos 3t = 4 cost - 3 cost that was derived in the video expresses cos 3t as a cubic O polynomial in x = cost, namely T3 (2) = 4x3 - 3x. Here is the graph of y = 4x - 3x. This polynomial is called the 3rd Chebyshev polynomial. Use the GeoGebra applet and the slider to determine, to two decimal places, the values T3 (0.5) = -1 , 13 (-0.1) = 0.296 and T3 (0.4) = -0.944

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