Find the exact value of the trigonometric expression without the use of a calculator.If tan ? = 
, ? < ? < 
and cos ? = - 
, 
< ? < ?, find the exact value of sin (? + ?).
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Find the volume.Find the volume of the solid generated by revolving the region under the curve 
from 
to 
about the 
A. 5
B. 
?
C. 10?
D. 5?
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Solve the equation.9x = 813x + 5
A. - 2
B. 2
C. - 
D. - 
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Establish the identity.cot ? ? sec ? = csc ?
What will be an ideal response?
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Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, let the last variable be the arbitrary variable.x - 8y + z = 23x - y + 2z = 6
A. 
B. 
C. ?
D. 
Mathematics