Answer:
Cos b
Step-by-step explanation:
1/2[sin(a+b)+sin(a-b)]
1/2[sin a cos b +cos a sin b + sin A cos B - cos A sin B]
1/2[2sin a cos b]
sin a cos b
Answer:
2
Step-by-step explanation:
to find slope use the equation-
y2-y1 / x2 - x1
then plug in your points
13-7 / 6-3
13-7 = 6
6-3 = 3
6/3 = 2
hope this helped :)
Answer:

Step-by-step explanation:
Given
--- rate of hard disk drives failure
--- number of hard disk drives
<em>See comment for complete question</em>
Required

First, calculate the probability that the none of the 4 selected is working;



Using the complement rule, the probability that at least 1 is working is:

This gives:


No its not an rational number.The answer is no