Find the equation of the tangent plane to the surface z = cos(4x)cos(3y) at the point (-2pi/2, pi/2, 0). z= ???

Which expression is equivalent to 3^3 + 2^2?

Which of the following can be used to explain a statement in a geometric proof?

Answer this two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: two right triangles abc and edc have a common vertex c. angle abc and edc are right angles. ab is labeled 13 feet, ac is labeled 15 feet, ec is labeled 10 feet, and ed is labeled 4 feet.what is the approximate distance, in feet, between the two poles? 11.14 feet16.65 feet14.35 feet15.59 feet