Express the sum or difference as a product of sines and/or cosines.cos(4?) - cos(6?)
A. -2 cos(5?) sin ?
B. 2 sin(5?) sin ?
C. -2 sin(5?) sin ?
D. cos(-2?)
Answer: B
Mathematics
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Find the limit.
e-x2 - y2
A. 1 B. 0 C. e-32 D. e32
Mathematics
Rewrite the given integral so that it fits the form 
, and identify u, du, and n.
A. 
; u = 1 + cos x, du = sin x dx, n = 
B. -
; u = cos x, du = -sin x dx, n = 
C. -
; u = 1 + cos x, du = -sin x dx, n = 
D. 
; u = sin x, du = (1 + cos x)1/2 dx, n = 1
Mathematics
Solve the problem. Round to the nearest hundredth.80 is 30% of what number?
A. 266.67 B. 24.00 C. 2666.70 D. 26.67
Mathematics
Multiply.-6ax4(9ax4 - 12x2 + 6)
A. -54a2x8 + 72ax6 - 36ax4 B. -54a2x8 - 12x2 + 6 C. -54a2x8 + 72ax6 D. -54ax4 + 72x2 - 36
Mathematics