# Trig Midterm

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1. sin2x + cos2x = 1
A.The Sum and Difference Identity

B.Reciprocal Identity
C.Half-Angle Identity
D.Double-Angle Identity
E.Pythagorean Identity
E.Pythagorean Identity
(this multiple choice question has been scrambled)
2. 1 + cot2x = csc2x
a.Pythagorean Identity
b.Double-Angle Identity
d.c.Reciprocal Identity
e.Half-Angle Identity
f.The Sum and Difference Identity
a.Pythagorean Identity
3. 1 + tan2x = sec2x
a.Pythagorean Identity
b.Double-Angle Identity
c.Reciprocal Identity
d.Half-Angle Identity
e.The Sum and Difference Identity
a.Pythagorean Identity
4. sin2x = 2sinx cosx
A.Pythagorean Identity
B.Half-Angle Identity
C.Double-Angle Identity
D.The Sum and Difference Identity

E.Reciprocal Identity
C.Double-Angle Identity
(this multiple choice question has been scrambled)
5. tan2x = (2tan x)/( 1- tan2x)
A.Pythagorean Identity
B.Half-Angle Identity
C.Double-Angle Identity
D.The Sum and Difference Identity
E.Reciprocal Identity
C. Double-Angle Identity
(this multiple choice question has been scrambled)
6. Ordered Pair
If x and y are real numbers, then (x,y) is an ordered pair of real numbers.
7. Linear equation in two variables
3x-7y=19 is the standard form
8. Pythagorean Theorem
in a right triangle the sum of the lengths of the legs in equal to the square of the length of the hypotenuse.
9. a2+b2=c2
Pythagorean Theorem
10. Distance Formula
The distance d between the points (x,y) and (x2,y2)
11. Midpoint Formula
/frac{x1+x2}{2}, /frac{y1+y2}{2}
12. The midpoint_______________.
of the line segment with endpoints (x1,y1) and (x2,y2)
13. The fixed distance is the ___________.