Complete the identity.1 - cos(2?) + cos(6?) - cos(8?) = ?
A. 4 sin ? sin(3?) sin(4?)
B. 4 cos ? cos(3?) sin(4?)
C. 4 cos ? cos(3?) cos(4?)
D. 4 sin ? cos(3?) sin(4?)
Answer: D
Mathematics
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For the given augmented matrix, find a value of k so that the associated linear system is inconsistent.
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What number is 75%of 400? ?
A. 309 B. 292 C. 297 D. 291 E. 300
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Provide an appropriate response.Let f(x) = 
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