Find the exact value of the expression.cos 10° cos 50° - sin 10° sin 50°
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Find the standard equation of the parabola with the given focus and directrix.Focus: (0, -3); directrix: y = 1
A. x2 = -8(y + 1) B. x2 = 8(y + 1) C. y2 = -8(x + 1) D. y2 = 8(x + 1)
Mathematics
Find the numbers at which f is continuous. At which numbers is f discontinuous?f(x) = 4 tan x
A. continuous for all real numbers
B. continuous for all real numbers except x = 
where k is an odd integer
C. continuous for all real numbers except x = 
where k is an odd integer
D. continuous for all real numbers except x = 0
Mathematics
Find the sum of the sequence.
A. -4 B. -10 C. -3 D. -12
Mathematics
Give the equation of the oblique asymptote, if any, of the function.f(x) = 
A. y = 0 B. y = x + 7 C. y = 7x D. no oblique asymptote
Mathematics