Complete the identity.The expression 
is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. sec2x
B. -cos2x
C. tan2x
D. csc2x
Answer: D
Mathematics
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Find an explicit formula for an.3, 5, 7, 9, 11, . . .
A. an = n + 4 B. an = 2n + 2 C. an = 2n + 1 D. an = n + 5
Mathematics
Factor the polynomial completely.15x2 + 4xy - 4y2
A. (15x + 2y)(x - 2y) B. (3x + 2y)(5x - 2y) C. (3x - 2y)(5x + 2y) D. prime
Mathematics
Graph the circle. Identify the center.(x - 4)2 + (y - 1)2 = 9
A. center: (4, 1)
B. center: (- 4, - 1)
C. center: (- 4, - 1)
D. center: (4, 1)
Mathematics
Tell whether each of the following statements is true or false.
a. {Real} ? {Integers} b. {Naturals} ? {Real}
Mathematics