Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
You might also like to view...
Find the product.(2z2 - 5z - 1)(z2 + 5z - 4)
A. 2z4 + 10z3 - 33z2 + 15z + 4 B. 2z4 + 5z3 - 34z2 + 15z + 4 C. 2z4 + 5z3 - 33z2 + 15z + 4 D. 2z4 + 10z3 - 34z2 + 15z + 4
Mathematics
State whether the equation is linear or quadratic.2x2 + 7x - 6 = 6x2
A. quadratic B. linear
Mathematics
Use the rational zero test to find all the rational zeros of f(x).f(x) = 4x4 + 3x3 - 17x2 - 12x + 4
A. Zeros: 2, -2, 1, -1/4 B. Zeros: 2, -1, 1/4 C. Zeros: -2, 2, -1, 1/4 D. Zeros: 2, -2, 1, -1
Mathematics
What are the dimensions of an isosceles right triangle with a four-inch hypotenuse and an area of 4 square inches? ?
A. 
in. × in. × 4 in.
B. 
in. × in. × 4 in.
C. 
in. × in. × 4 in.
D. 
in. × in. × 4 in.
E. 
in. × in. × 4 in.
Mathematics