Trig Identity proofs
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6 Terms
1
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Reciprocal identities
cscθ = 1/ sinθ, secθ = 1/ cosθ, cot θ = 1/ tanθ
2
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Pythagorean Identities
sin2 θ + cos2 θ= 1, tan2 θ + 1 = sec2θ, 1 + cot2θ = csc2 θ
3
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Quotient(Ratio) Identities
tanθ = sinθ / cosθ, cot = cosθ / sinθ
4
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Even Odd Identities
sin(-θ) = -sinθ, cos(-θ) = cosθ, tan(-θ)= -tanθ
5
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Right Triangle Ratios(1)
sinθ = opp/hyp = y/r, cosθ = adj/hyp= x/r, tanθ = opp/adj = y/x
6
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Unit Circle Ratios
sinθ = y, cosθ = x, tanθ = y/x, cscθ = 1/y, secθ = 1/x, cotθ = x/y
Note 
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