Provide an appropriate response.Derive the identity:cos (? + ?) + cos (? - ?) = 2 cos ? cos ?
What will be an ideal response?
cos (? + ?) + cos (? - ?) = (cos ? cos ? - sin ? sin ?) + (cos ? cos ? + sin ? sin ?)
= 2 cos ? cos ?
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Find the least common multiple of the given number by the method of intersection of sets of multiples.125 and 275
A. 275 B. 1375 C. 55 D. 34,375
Provide an appropriate response.The standard normal probability density function is defined by f(x) = 
e- x2/2. (a) Show that 
dx = 
.(b) Use the result in part (a) to show that the standard normal probability density function has mean 0.
What will be an ideal response?
Prepare a probability distribution for the experiment. Let x represent the random variable, and let P represent the probability.Two marbles are drawn from a bag in which there are 4 red marble and 2 blue marble. The number of blue marbles is counted.
A. 
B. 
C. 
D. 
Solve the equation by making an appropriate substitution.x4 - 40x2 + 144 = 0
A. {4, 36} B. {2, 6} C. {-2, 2, -6, 6} D. {-2i, 2i, -6i, 6i}