New trig identities
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9 Terms
1
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sec(x) =
1 / cos(x)
2
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cosec(x) =
1 / sin(x)
3
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cot(x) =
1 / tan(x) or cos(x) / sin(x)
4
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sin and cos equation?
sin²(x) + cos²(x) = 1
5
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how to derive sin²(x) + cos²(x) = 1
right angled triangle, hypotenuse 1. one length sin(x) other cos(x) .
using Pythagoras, sin²(x) + cos²(x) = 1
6
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tan and sec equation?
tan²(x) + 1 = sec²(x)
7
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derive tan and sec equation
divide sin²(x) + cos²(x) = 1 by cos²(x)
you get tan²(x) + 1 = sec²(x)
8
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cot and cosec equation/
1 + cot²(x) = cosec²(x)
9
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derive cot and cosec equation
divide sin²(x) + cos²(x) = 1 by sin²(x)
you get, 1+ cot²(x) = cosec²(x)
Note 
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