? is an acute angle and sin ? is given. Use the Pythagorean identity sin2 ? + cos2 ? = 1 to find cos ?.sin ? = 
A. 3
B. 2
C. 
D. 
Answer: C
Mathematics
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Decide whether the figure is convex or not convex.
A. Not convex B. Convex
Mathematics
Solve the problem.Find the moment of inertia Iy of a tetrahedron of constant density 
bounded by the coordinate planes and the plane 
.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.An object is suspended from a coiled spring. It is pulled downward and released. The position P above or below its rest position after t seconds is given by P = -e-x/2? cos xFind all values of t (0 ? t < 4?) for which the object is at the rest position and graph the equation for 
What will be an ideal response?
Mathematics
Solve.Find the measure of the angle, to the nearest degree, from l1 to l2:l1: 
l2: 
A. 30° B. 173° C. 135° D. 45°
Mathematics