Trig Identities Quiz Review
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Reciprocal, Quotient, Pythagorean, Sum & Difference, and Double-Angle Identities
Last updated 1:17 PM on 3/27/25
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16 Terms
1
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sin(A + B)
sinAcosB + sinBcosA
2
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sin(A - B)
sinAcosB - sinBcosA
3
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cos(A + B)
cosAcosB - sinAsinB
4
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cos(A - B)
cosAcosB + sinAsinB
5
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sin2A
2sinAcosA
6
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cos2A
cos2A - sin2A
7
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sinθ
1/cscθ
8
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cscθ
1/sinθ
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cosθ
1/secθ
10
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secθ
1/cosθ
11
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tanθ
1/cotθ
12
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cotθ
1/tanθ
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tanθ
sinθ/cosθ
14
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cotθ (quotient identity)
cosθ/sinθ
15
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Pythagorean identities
sin²(x) + cos²(x) = 1
tan²(x) + 1 = sec²(x)
and 1 + cot²(x) = csc²(x).
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Other forms of reciprocal identities
cosθsecθ = 1
sinθcscθ = 1
tanθcotθ = 1
