Find the exact value of the trigonometric expression without the use of a calculator.If cos ? = - 
, 
< ? < ? and sin ? = - 
, ? < ? < 
, find the exact value of cos (? + ?).
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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A. (8y - 4)(y + 5) B. 8y2 - 36y - 20 C. 4(2y + 1)(y - 5) D. 4(2y - 1)(y + 5)
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Divide and check your answer.33,560 ÷ 20
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Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
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