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How was C2?!

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what were the angles for this question >>> .... (1- 5 cos2x ) sin 2x = 0 ???
 
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Value of X for Cylinder is 2.122
Minimum Area = 84.84 = 85 (Nearest Integer)

Perimeter = 5+5+(5*1.855)=19.275

Sum of nth Terms is the Proof:
1. Sn=a+ar+ar^2+...+ar^(n-1)
2. rSn=ar+ar^2+...+ar^n
1. - 2. = a-ar^n
Sn(1-r) = a(1-r^n)
Sn = (a(1-r^n))/(a-r)

YESSSSSSS AHAAHHAAAAAAAAY GNNA GET AN A INSHALLAH !!! =P
 
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For that question I found 5 Answers for X
Modify Range since it is for 2x => 0≥2x≤360
Sin2x = 0
Cos2x = 1/5

2x=0°, 180°,360°
2x = 78.5°, 281.5°

Final Solutions of X=0°, 39.3°, 90°, 140.8°, 180°
All must be in 1 Decimal Place
 
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For that question I found 5 Answers for X
Modify Range since it is for 2x => 0≥2x≤360
Sin2x = 0
Cos2x = 1/5

2x=0°, 180°,360°
2x = 78.5°, 281.5°

Final Solutions of X=0°, 39.3°, 90°, 140.8°, 180°
All must be in 1 Decimal Place
Hey! My solutions were only 39.3 nd 140 :O
 
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Yes:

Tan2x = 5Sin2x
Sin2x/Cos2x = 5Sin2x
Sin2x = 5Sin2xCos2x
Sin2x - 5Sin2xCos2x = 0
Sin2x(1-5Cos2x) = 0 <= This was Given
 
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For that question I found 5 Answers for X
Modify Range since it is for 2x => 0≥2x≤360
Sin2x = 0
Cos2x = 1/5

2x=0°, 180°,360°
2x = 78.5°, 281.5°

Final Solutions of X=0°, 39.3°, 90°, 140.8°, 180°
All must be in 1 Decimal Place

(y)
 
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z3r0thunder -- For the volume of cylinder - I am just wondering what was the formula shown in the paper - was it 2πx² + 120/4π or 2πx² + 60/4π.
 
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