The coefficients of Chebyshev polynomials of the first kind can be found us
The coefficients of Chebyshev polynomials of the first kind can be found using identities involving this function. This function of a complex number z is the arithmetic mean of e to the i times z and that exponential's reciprocal. This function is on the main diagonal of a two-dimensional rotation matrix. A complex number's magnitude times this function of its argument yields its (*) real part. This even function is equal to its own fourth derivative, and its Taylor expansion begins 1 minus x-squared over 2. c-squared equals a- squared plus b-squared minus 2 a b times this function of angle C, according to its namesake law in triangles. For 10 points, identify this trigonometric function, which for an angle in a right triangle equals adjacent over hypotenuse.