Use the basic identities to simplify the expression.(1 - cos ?)(1 + cos ?) + cos2 ?
A. 2 cos2 ?
B. 0
C. 2
D. 1
Answer: D
Mathematics
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Evaluate the function f at the indicated value.
{7x + 1, if x < 99x, if 9 ? x ? 139 - 9x, if x > 13
A. 64 B. 90 C. -62 D. -81
Mathematics
Write a mathematical expression for the situation described.Two numbers have a sum of 23. If one number is q, express the other number in terms of q.
A. q + 23 B. 23 - q C. 23 - 2q D. q - 23
Mathematics
Find the domain of the indicated combined function.Find the domain of (f - g)(x) when f(x) = 9x - 8 and g(x) = 4x - 7.
A. Domain: (-9, 8) B. Domain: (-?, ?) C. Domain: (-8, 9) D. Domain: (-8, ?)
Mathematics
Solve the absolute value equation.|x + 2| = |8 - x|
A. ?
B. 3
C. - 
D. 6
Mathematics