Establish the identity.cos(3x) = cos3 x - 3 sin2 x cos x
What will be an ideal response?
cos(3x) = cos(2x + x) = cos(2x) cos x - sin(2x) sin x = (cos2 x - sin2 x) cos x - 2 sin x cos x sin x = 
- sin2 x cos x - 2 sin2 x cos x = cos3 x - 3 sin2 x cos x.
Mathematics
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dt
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B. - 
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+ C
C. -cos 
+ C
D. 
cos 
+ C
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Choose the correct symbol for the blank:5 _____ 9
A. =
B. ?
C.
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Solve the problem.Starting from Joe's Gas Station, a car travels due north on Avenue A for 3.4 mi, then turns right and travels on Cedar Street for 1.0 mi, and then turns right again and travels on Washington Avenue for 0.9 mi. How far is the car from Joe's Gas Station? Round your answer to the nearest tenth if necessary.
A. 1.3 mi B. 3.4 mi C. 2.7 mi D. 3.5 mi
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Solve.
+ 5 = 11
A. 2 B. 12 C. 32 D. 36
Mathematics