Solve for the angle ?, where 0 ? ? ? 2?cos2? = 
A. ? = 
, 
, 
, 
B. ? = 
, 
, 
, 
C. ? = 0, ?, 2?
D. ? = 
, 
, 
, 
Answer: B
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Solve the problem.A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds. Find the probability that a randomly selected boy in secondary school will take longer than 335 seconds to run the mile.
A. 0.9893 B. 0.4893 C. 0.5107 D. 0.0107
If R1 = 33 Kê and R2 = 22 Kê, find GT.
a. 75.76 æS
b. 18.18 æS
c. 90.91 æS
d. 55 Kê
e. 13.2 Kê
Evaluate the integral.
A. 
B. 
C. 
D. 
Evaluate the indicated trigonometric function of the acute angle ?.If ? is an acute angle of a right triangle and if cos ? = 
, then find the value of cot ?.
A. 
B. 
C. 
D. 