AP Pre Cal formulas
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Last updated 1:38 AM on 5/21/25
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11 Terms
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Pythagorean identity (cos and sin)
cos²+sin²=1
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Pythagorean identity (tan and sec)
1+tan²=sec²
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Pythagorean identity (cot and csc)
cot²+1=csc²
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Double angle- Sin
sin(2θ) = 2sin(θ)cos(θ)
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Double angle-Cos
cos(2θ) = 2cos²(θ) - 1
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sin(a+b)
sin(a)cos(b) + cos(a)sin(b)
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cos(a+b)
cos(a)cos(b) - sin(a)sin(b)
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Polar coords
r,θ
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Radius from rectangular coordinates
(x² + y²) =r²
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Theta from rectangular coordinates
θ = tan⁻¹(y/x)
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Polar to rectangular
x=rcos(θ) and y=rsin(θ)
