Trig Identities

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11 Terms

1

sin²(θ)+cos²(θ)

1

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2

1+tan²(θ)

sec²(θ)

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3

cot²(θ)+1

csc²(θ)

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4

sin(2x)

2sin(x)+cos(x)

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5

cos(2x) (= 2 things…)

cos²(x)-sin²(x)=1-2sin²(x)

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6

cos²(x)

½(1+cos(2x))

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7

sin²(x)

½(1-cos(2x))

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8

tan(θ)

sin(θ)/cos(θ)

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9

cot(θ)

cos(θ)/sin(θ)

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10

csc(x) (= 2 things…)

1/sin(x) OR sin(x)csc(x)=1

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11

sec(x) (= 2 things…)

1/cos(x) OR cos(x)sec(x)=1

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