Find the Exact Value of the Expression, If It Is $\tan ^ { - 1 } ( \tan ( - \pi / 4 ) )$

Q71: The function <span class="ql-formula" data-value="y

Q72: Find the sign of <span

Q73: Find the approximate value of

Q74: Sketch the graph of <span

Q75: Find the amplitude, period and phase

Q77: Find the value of <span

Q78: Find the sign of <span

Q79: Find the period of the function

Q80: Suppose that the terminal point determined

Q81: Indicate if the function <span