Use the product-to-sum identities to rewrite the expression as the sum or difference of two functions.sin 
? sin 
?
A. 
B. 
C. 
D. 
Answer: D
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Add.18,724,5052,589,716835,223
A. 30,308,414 B. 30,438,414 C. 37,825,421 D. 30,296,284
Solve the problem.The table shows the number of deaths due to car accidents in a certain city in various years. 
Let n = f(t) be the number of deaths due to car accidents at t years since 2012. Find a quadratic equation for f in vertex form. Use the data for the year 2015 as the vertex and use the data for the year 2017 to find the value of a.
A. f(t) = -4.25(t - 3)2 + 202 B. f(t) = -12.75(t - 3)2 + 270 C. f(t) = -2.04(t - 3)2 + 270 D. f(t) = 4.25(t - 3)2 + 202
Find the curvature of the space curve.r(t) = ti + (sinh t)j + (cosh t)k
A. ? = sinh2 t
B. ? = cosh2 t
C. ? = 
D. ? = 
Eliminate the parameter. Write the resulting equation in standard form.An ellipse: x = 3 + 4 cos t, y = 4 + 6 sin t
A. (x - 3)2 + (y - 4)2 = 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1