Some trig identities

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14 Terms

1

Pythagrean

Sin²x + Cos²x =1

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2

Double angle (sin)

Sin2x = 2SinxCosx

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3

Double angle (cos)

Cos2x = Cos^2x-Sin^2x

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4

Sum / Difference (sin)

Sin(x +- y) = SinxCosy +- CosxSiny

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5

Sum / Difference (cos)

Cos(x +- y) = CosxCosy -+ SinxSiny

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6

“Invertible”

Passes horizontal line test

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7

Tan Period

pi

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8

Parent Function of any trig equation

Atrig(B(x-C))+D

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9

Sec

1/Cos

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10

Csc

1/sin

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11

Cot

Cos/Sin

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12

Period of sin and cosine

2pi

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13

Period of Sec and Csc

2pi

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14

Period of Cot

pi

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