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Zachary Z.
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Pre-Calculus
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Question:

Which trigonometric functions are Even Functions?

Zachary Z.

Cosine and Secant

Trigonometry
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Question:

$$cos(\sqrt3/2)=x$$

Zachary Z.

$$x=\pi/3,5\pi/3$$

Geometry
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Question:

Find the circumference of a circular disk whose area is 100 Pi spare centimeters.

Zachary Z.

Let r be the radius of the disk. Area equals 100 Pi, therefore 100 Pi = Pi r^2 solve for r r=10 Circumfrence = 2Pi r= 20Pi

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