Write the expression in terms of sine and cosine, and simplify so that no quotients appear in the final expression.
A. cos3?
B. sin ?
C. tan2?
D. sec2?
Answer: B
Mathematics
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Find the inverse of the matrix (if it exists).A = 
A. A-1 = 
B. A-1 = 
C. A-1 = 
D. A-1 = 
Mathematics
Factor the trinomial completely.x3 + 5x2 - 84x
A. x(x - 12)(x + 7) B. (x2 + 7)(x - 12) C. x(x + 12)(x - 7) D. (x2 + 12)(x - 7)
Mathematics
Solve the problem.Suppose that y is directly proportional to x and that y = 39 when x = 6. Find the constant of proportionality k. Then use y = kx to find y when x = 15.
A. k = 6.25; y = 93.75
B. k = 6.5; y = 112.5
C. k = 6.5; y = 97.5
D. k = 234; y = 
Mathematics
Multiply and simplify.
? 
A. 1
B. 
C. -1
D. 0
Mathematics