Choose the expression which is equivalent to the given expression.
A. cos2 20°
B. cot 20°
C. tan 20°
D. sin2 20°
Answer: A
Mathematics
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Find the polar coordinates of the point(s) of intersection of the given curves for 
r = 1 + sin ?, r = 1 - sin ?
A. (0, 0), (0, ?)
B. 
, 
C. 
, 
D. (1, 0), (1, ?)
Mathematics
Use the fundamental identities to find the value of the trigonometric function.Find cos ?, given that sin ? = - 
and ? is in quadrant III.
A. - 
B. 
C. - 
D. - 
Mathematics
Solve the problem.The temperature, t, in degrees Fahrenheit, of water 
65 + 
m where m is the number of minutes since heating began. How long will it take for the temperature of the water to reach 70 degrees Fahrenheit?
A. 40 min B. 14 min C. 17 min D. 20 min
Mathematics
Divide.
÷ 
A. 
B. 
C. 
D. 
Mathematics