Complete the identity.sec4 x + sec2 x tan2 x - 2 tan4 x = ?
A. 4 sec4 x
B. sec4 x + 2
C. tan2 x - 1
D. 3 sec4 x - 2
Answer: D
Mathematics
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A. 
B. -1
C. 1
D. - 
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Find the exact or approximate circumference of the circle, as indicated.Find the approximate circumference. Use 
for ?.
A. 220 cm B. 15,400 cm C. 110 cm D. 440 cm
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Solve the problem.Find an equation for the horizontal tangent to the curve at P.
A. y = 
B. y = 
C. y = 1
D. y = 0
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Divide.
A. r2 + 4 B. r - 4 C. r + 4 D. r2 - 4
Mathematics