Find a rectangular equation for the plane curve defined by the parametric equations.x = t2 + 1, y = t2 - 1
A. y = x2 + 2, x ? 1
B. y = x + 2, x ? 1
C. y = x - 2, x ? 1
D. y = x2 - 2, x ? 1
Answer: C
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. y = sec x, y = tan x, x = 0, x = 
A. 
B. 
C. 
D. 
Simplify the expression.
A. 
B. 6x
C. 
D. 12x
Fifty percent of students enrolled in an astronomy class have previously taken physics. Thirty percent of these students received an A for the astronomy class, whereas twenty percent of the other students received an A for astronomy.Find the probability that a student selected at random previously took a physics course, given that they received an A in the astronomy course.
A. 0.40 B. 0.15 C. 0.25 D. 0.6 E. none of these
In the problem, t is a real number and P = (x, y) is the point on the unit circle that corresponds to t. Find the exact value of the indicated trigonometric function of t.(
, 
)Find sec t.
A. 
B. 
C. 
D. 