Use a sum-to-product identity to rewrite the expression.sin 15° - sin 31°
A. 2cos (-8.0°) sin (23.0°)
B. 2sin (-8.0°) sin (23.0°)
C. 2sin (-8.0°) cos (23.0°)
D. 2cos (-8.0°) cos (23.0°)
Answer: C
Mathematics
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Use the basic identities to simplify the expression.(1 - cos ?)(1 + cos ?) - sin2 ?
A. sin2 ? B. 2 C. 1 D. 0
Mathematics
Factor using the trial and error method.9x2 + 24x + 16
A. (9x - 4)(x - 4) B. (3x + 4)(3x + 4) C. (3x - 4)(3x - 4) D. (9x + 4)(x + 4)
Mathematics
Solve the problem.A satellite is orbiting the earth such that its displacement D north of the equator (or south if D < 0) is given by 
Sketch two cycles of D as a function of t. Use 
, and 
.
A. 
B. 
C. 
D. 
Mathematics
Provide an appropriate answer.Find 
when r = 2 and s = 1 if w(x, y, z) = xz + y^2, x = 3r + 3, y = r + s, and z = r - s.
A. 
= 14
B. 
= 18
C. 
= 3
D. 
= 12
Mathematics