Use trigonometric identities to find the exact value.
A. 
B. 
C. 
D. 2
Answer: B
You might also like to view...
Solve the problem.The curve x = y2 is revolved about the x-axis. Find a parametrization of the surface of revolution and then find the equation of the tangent plane at the point 
What will be an ideal response?
Solve the problem.Find f(?) if 
= x sin 4x.
A. 4 B. 0 C. ? D. 4?
Find the reference angle for the given angle.55°
A. 145° B. 125° C. 55° D. 35°
Solve the problem.Consider the quadratic model h(t) = -16t2 + 40t + 50 for the height (in feet), h, of an object t seconds after the object has been projected straight up into the air. Find the maximum height attained by the object. How much time does it take to fall back to the ground? Assume that it takes the same time for going up and coming down.
A. maximum height = 75 ft; time to reach ground = 2.5 seconds B. maximum height = 50 ft; time to reach ground = 2.5 seconds C. maximum height = 75 ft; time to reach ground = 1.25 seconds D. maximum height = 50 ft; time to reach ground = 1.25 seconds