Rewrite the following as a product of trigonometric functions.sin 19° + sin 21°
A. 2 cos 20° cos(-1°)
B. 2 sin 20° cos(-1°)
C. 2 cos 20° sin(-1°)
D. 2 sin 20° sin(-1°)
Answer: B
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Multiply by using the rule for the square of a binomial.
2
A. 121x2 + 
x + 
B. 121x2 + 2x + 
C. 121x2 + 
D. 121x2 + x + 
Solve the system of equations.7x + 7y + z = 1 x + 8y + 8z = 89x + y + 9z = 9
A. (0, 0, 1) B. (-1, 1, 1) C. (1, -1, 1) D. (0, 1, 0)
Solve triangle ABC. If necessary, round the answer to the nearest tenth.B = 20.2°, C = 108.0°, b = 21.9 inches
A. A = 49.8°, a = 62.30 in., c = 51.80 in. B. A = 49.8°, a = 60.3 in., c = 49.8 in. C. A = 51.8°, a = 49.8 in., c = 60.3 in. D. A = 51.8°, a = 51.80 in., c = 62.30 in.
Reduce the fraction by finding a common factor in the numerator and in the denominator and dividing by the common factor.
A. 
B. 
C. 
D. 