Precalculus Trigonometry Identities

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Last updated 4:25 AM on 1/8/26
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10 Terms

1
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cscθ=

1/sinθ

2
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secθ=

1/cosθ

3
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tanθ=

sinθ/cosθ

4
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cotθ=

1/tanθ or cosθ/sinθ

5
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sin2θ+cos2θ=

1

6
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tan2θ+1=

sec2θ

7
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cot2θ+1=

csc2θ

8
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What is the domain, range, y-intercept, and x-intercept for y=cosx?

D: xER

R: [-1,1]

Y-Int.: (0,1)

X-Int.: pi/2+_pi n

9
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What is the domain, range, y-intercept, and x-intercept for y=sinx?

D: xER

R: [-1,1]

Y-Int.: (0,0)

X-Int.: 0+_pi n

10
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What is the domain, range, y-intercept, and x-intercept for y=tanx?

D: xER, x=/ pi/2+_pi n

R: yER

Y-Int.: (0,0)

X-Int.: 0+_pi n