Fun and challenging trigonometric problems
18 videos • 23,872 views • by blackpenredpen
Fun and challenging trigonometric problems
1
The sine triangle problem
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2
exact value of sin(10 degrees)
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3
Be careful with the law of sines (but law of cosine is okay!)
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4
solving tan(1/x)=1/tan(x)
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5
Quintic Equation From Chebyshev Polynomial
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6
I know you wanted to cancel the sine, but really?
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7
Find the minimum of abs(sin(x)+cos(x)+tan(x)+csc(x)+sec(x)+cot(x))
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8
So classic: arctan(1/2)+arctan(1/3)=?
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9
which one is a circle? (precalculus, polar coordinate)
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10
How to find the value of tan(x) when given sin(x)+cos(x)=1/5
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11
How to solve this trigonometric equation from another one
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12
Finding the exact value of sin(18 degrees)
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13
They changed the sine to cosine!
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14
Solving an algebra problem with trigonometry! (De Moivre's theorem)
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15
sin(3x) & cos(3x), using De Moivre's theorem
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16
sin(10°)sin(30°)sin(50°)sin(70°) = ? No calculator!
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17
Proving sin(10 deg) is irrational
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18
The famous problem: cos(20 deg)cos(40 deg)cos(80 deg)
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