Pre Calc Trig Identities

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Last updated 11:29 PM on 5/11/26
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13 Terms

1
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tanx =

sinx/cosx

2
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cotx=

cosx/sinx or 1/tanx

3
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secx=

1/cosx

4
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cscx=

1/sinx

5
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sin(2x)=

2sinx cosx

6
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cos (2x)=

cos²x-sin²x

7
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how do you find the polar function points when given two points on a graph

square root x²+y²

8
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sin²x-1=

cos²x

9
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tan²x+1=

sec²x

10
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1+cot²x=

csc²x

11
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sin(x+-y)=

sin(x)cos(y)+-cos(x)sin(y)

12
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cos(x+-y)=

cos(x)cos(y)-+sin(x)sin(y)

13
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what is the polar form formula?

r cos(theta))+i(r sin(theta)) = (r times theta) + i(r times theta) = complex number