Answer:
see below
Step-by-step explanation:
sin x cos x = cot x
We need to show a counter example
Let's use 30 degrees
sin 30 cos 30 = cot 30
1/2 * sqrt(3) /2 = sqrt(3)
sqrt(3)/4 = sqrt(3)
not true
Use the trigonometry triangles SOH CAH TOA
Sin= opposite/hypotenuse
Opposite= opposite the angle
Hypotenuse is the longest side
Answer: 
This is the same as 
units are in cubic centimeters
==============================================
Work Shown:
d = 14 is the diameter
r = d/2 = 14/2 = 7 is the radius

Answer:
1. 7,700 grams 2. 420,000 milligrams or 420 grams
It gets 25$ off at first then 30$ off so the price would be 70$