Trig Flashcards

1
Q

Cosine Law

A

a^2=b^2+c^2-2bcCosA

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2
Q

Sine Law

A

SinA/a = SinB/b = SinC/c = …

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3
Q

Sin0

A

0

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4
Q

Sin30

A

Root1 /2

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5
Q

Sin45

A

Root2 /2

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6
Q

Sin60

A

Root3 /2

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7
Q

Sin90

A

Root4 /2 aka 1

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8
Q

Cos0

A

Root4 /2 aka 1

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9
Q

Cos30

A

Root3 /2

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10
Q

Cos45

A

Root2 /2

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11
Q

Cos60

A

Root1 /2

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12
Q

Cos90

A

0

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13
Q

Tan0

A

0

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14
Q

Tan30

A

1/root3

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15
Q

Tan45

A

1

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16
Q

Tan60

A

Root3

17
Q

Tan90

A

Undefined

18
Q

Reciprocal identity (sin)

A

Sinx = 1/cscx

19
Q

Reciprocal Identity (cos)

A

Cosx = 1/secx

20
Q

Reciprocal identity (tan)

A

Tanx = 1/cotx

21
Q

Reciprocal identity (csc)

A

Cscx = 1/sinx

22
Q

Reciprocal identity (sec)

A

Secx = 1/cosx

23
Q

Reciprocal identity (cot)

A

Cotx = 1/tanx

24
Q

Quotient identity

A

Tanx = sinx/cosx

Cotx = cosx/sinx

25
Q

Pythagorean identity

A

sin^2x + cos^2x = 1

1 + cot^2x = csc^2x

Tan^2x + 1 = sec^2x

26
Q

Angle less than 90

A

Measure the sides

a >/= b, one solution

a < b, bSinA

27
Q

a = bSinA

A

One solution

28
Q

a < bSinA

A

No solutions

29
Q

a > bSinA

A

Two solutions

30
Q

Angle greater than/equal to 90

A

Measure the sides

a>b, one solution

a = b, no solutions