Evaluate cos(65º) using the actual formula of cos which is given by: Cos(x) = 1- Use only 5 iterations. In each iteration, compute f(x), Ea and Et. Note that the true value is : 0.42261826291556 and 650 1.13446401 radian You can approximate cos x to 8 significant figures.

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.