Trigonometry

Question 1

What is the Sin graph?

Answer 1

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Sin ( 0 ) = 0
Sin(90 ) = 1
Sin(180) = 0
Sin(270) = -1
Sin(360) = 0

Question 2

What is the Cos graph?

Answer 2

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Cos ( 0 ) = 1
Cos(90 ) = 0
Cos(180) = -1
Cos(270) = 0
Cos(360) = 1

Question 3

What is the Tan graph?

Answer 3

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The tan graph never reaches 90

Question 4

What is the Sine rule?

Answer 4

SinA/a = SinB/b
a/SinA = b/SinB

Question 5

What is the Cosine rule?

Answer 5

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

Question 6

How do you find the area of a Triangle?

Answer 6

area = 1/2abSinC

Question 7

What are the trigonometry identities?

Answer 7

Tan(X) = Sin(X)/Cos(X)

Sin^2(X) + Cos^2(X) = 1

Question 8

What is the domain?

Answer 8

The set of values the answers fall between - length of the graph

Question 9

Can there be more than one answer to a trig equation, and how do you find them?

Answer 9

Yes:
Sin - Find the values either side of 90, then +-360
Cos - Find the values either side of 180, then +-360
Tan - repeats every 180 so +-180

Question 10

What is an acute, obtuse and reflex angle?

Answer 10

Acute: Between 0 and 90
Obtuse: Between 90 and 180
Reflex: Between 180 and 270

Question 11

How do you solve trig equations?

Answer 11

1. Multiply domain
2. solve
3. Add or minus 360 until of of domain
4. divide answers