Complete the identity.
= ?
A. 2 cos (6?) cos (2?)
B. 2 cos (2?)
C. - sin (2?)
D. -2 cos (6?) sin (2?)
Answer: C
Mathematics
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Evaluate the integral.
A. 
?2 cos 3
B. 
?2 cos 3
C. 
? cos 3
D. 
? cos 3
Mathematics
Evaluate the spherical coordinate integral.
A. 
?
B.
 ? |
C.
?D.
?
Mathematics
Perform the indicated operation.(5n7 - 3n6 + 10) - (-9n6 + 7n7 + 10) + (n8 + 1)
A. n8 - 2n7 + 4n6 + 21 B. 5n13 C. n8 - 2n7 + 6n6 + 1 D. n8 - 2n7 + 6n6 + 21
Mathematics
Solve.Melissa invested an amount of money in a stock that earned an annual 3% return. She invested three times the original amount in another stock that earned an annual 5% return. If her total yearly return from both investments was $3600, find out how much she invested at 3%?
A. $15,000 B. $20,000 C. $135,000 D. $45,000
Mathematics