Express the sum or difference as a product of sines and/or cosines.cos(7?) - cos(3?)
A. -2 cos(5?) sin(2?)
B. 2 cos(2?)
C. -2 sin(5?) sin(2?)
D. 2 cos(5?) cos(2?)
Answer: C
Mathematics
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Solve.
= 4
A. 1 B. ±7 C. 1, 7 D. 7, 1j
Mathematics
Solve the inequality, and graph the solution set.(b + 7)(b + 4)(b + 1) < 0
A. (-1, ?)
B. (-?, -7) ? (-4, -1)
C. (-7, -4) ? (-1, ?)
D. (-?, -4)
Mathematics
Solve the equation.4y - 9 + y = 21 + 3y - 4y
A. 5
B. 2
C. 3
D. 
Mathematics
Factor out the greatest common factor.21x4 - 9x3 + 15x2
A. x2(21x2 - 9x + 15) B. 3x(7x3 - 3x2 + 5x) C. 3x2(7x2 - 3x + 5) D. 3(7x4 - 3x3 + 5x2)
Mathematics