Use the figure below to find the exact value of the given trigonometric expression. 
Definitions:
Comparable
Similar or equivalent in some respects, though not identical, typically used for assessment or comparison.
Control
In experimental design, control refers to an experimental group that does not receive any experimental treatment in order to provide a baseline for measuring changes that might occur in other groups. As a goal of research, control refers to gaining information about human behavior in order to be able to predict and control it.
Experimental Design
A research method involving the manipulation of one or more independent variables to determine their effect on dependent variables, allowing for control of confounding factors to establish causality.
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