Establish the identity.cos
= 
cos x - 
sin x
What will be an ideal response?
cos 
= cos x cos 
- sin x sin 
= 
cos x - 
sin x.
Mathematics
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Find the area of the rectangle or square.
A. 21 square miles B. 160 square miles C. 42 square miles D. 80 square miles
Mathematics
Solve the problem.The roof of a building is in the shape of the hyperbola 
where x and y are in meters. Refer to the figure and determine the height h of the outside walls.
a = b = 9 m
A. 11.7 m B. 25 m C. 137 m D. 47 m
Mathematics
Solve the equation.2[-7x + 5 - 4(x + 1)] = -6x + 7
A. 
B. 
C. 
D. 
Mathematics
Find the fifth term and the nth term of the geometric sequence whose initial term, a, and common ratio, r, are given.a = -6; r = -3
A. a5 = 162; an = -6 ? (-3)n-1 B. a5 = 162; an = -6 ? (-3)n C. a5 = -486; an = -6 ? (-3)n-1 D. a5 = -486; an = -6 ? (-3)n
Mathematics