Multiple Choice Question: Which of the following has the same value as $\cos \theta$?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

A circle of radius 15 cm is revolved about a line tangent to it. What is the surface area of the resulting by the solid?
It is an overflow structure built across an open channel for the purpose of measuring and controlling the flow.
Ernie’s average in 6 subjects is 83. If his lowest grade is disregarded, his remaining subject is 84. What is his lowest grade?
Determine the minimum value of a force F required to cause an impending motion of a 30 kg block up a 30° incline if the coefficient of friction of the block and the incline is 0.25.
Find the equation of a line having a slope of 2 and y-intercept of 3.
Find k so that the expression kx^2 - 3kx + 9 is a perfect square.
$\log_3 11 = x$. What is the value of x?
If one third of the air in the tank is removed by each stroke of an air pump, what part of the total air will be removed in 6 strokes?
jPxd93H-2 Find the dot-product $\mathbf{A} \cdot \mathbf{B}$
Given a right triangle where the hypotenuse is r, the acute angle theta, the opposite vertical side y and adjacent side x.
Solve for x if $\dfrac{e^x + e^{-x}}{2} = 1$.
A combination lock has 60 different positions. To open the lock, the dial is turned to a certain number in the clockwise direction, then to a number in the counterclockwise direction, and finally to a third number in the clockwise direction.
In a lifting machine, a load of 50 kN is moved by a distance of 10 cm using an effort of 10 kN which moves through a distance of 1 m, the efficiency of the machine is…
In a 1:2:4 job mix concrete, how many parts is fine aggregates?
Spherical degree is a unit of a spherical area taken as 1/720 of the surface of the sphere. How many spherical degrees hemispheres have?