The Correct answer is C.
Explanation
To evaluate the expression , it is necessary to determine the values of
and
. Since the sum of the measures of the angles of any triangle is
degrees, and a right angle has measure
degrees, the value of
can be found by solving the equation
. This yields
. The value of
can be found by solving the equation
. This yields
. Finally, the values for
and
are substituted into the expression
to obtain
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