Use the following half-angle identity to find the exact value of tan165°.
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Use the function nest to evaluate p(x) = 1 + x + · · · + x50 at x = 1.00001. (use the matlab ones command to save typing.) find the error of the computation by comparing with the equivalent expression q(x) = (x51 − 1)/(x − 1).

The step function g(x) is defined as shown. what is the range of g(x)? ***answer choices in picture.

What is the value of x when x + 7 = 21?