Find the exact value of the expression.cos 
sin 
- cos 
sin 
A. 
B. 
C. 
D. 1
Answer: C
Mathematics
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Solve the polynomial inequality. Express the solution in interval notation.x2 - 4x - 21 ? 0
A. [7, ?) B. [-3, 7] C. (-?, -3] ? [7, ?) D. (-?, -3]
Mathematics
Simplify. Assume that all variables represent non-negative real numbers.
A. -2a2b
B. 2
C. 2ab
D. 2ab
Mathematics
Write a general formula to describe the variation.R varies directly with g and inversely with the square of h; R = 3 when g = 3 and h = 5.
A. R = 5
B. R = 25gh2
C. R = 5
D. R = 25
Mathematics
Verify the identity.cos 4? = 2 cos2(2?) - 1
What will be an ideal response?
Mathematics